Branches of Mathematics

Pure mathematics

• Algebra
• Calculus
• Geometry
• Topology
• Trignometry
• Combinatorics
• Logic
• Number theory

Applied mathematics

• Dynamical systems and differential equations
• Mathematical physics
• Computing
• Information theory and signal processing
• Probability and statistics
• Game theory
• Operations research

Related Topics

• Electromagnetic Spectrum
• Linear Equations
• Applied Physics
• Nano Technology
• Engineering Sciences
• Mathematical Medicine
• Fluid dynamics
• Computational Mathematics
• Gamma Ray Optics
• Onfrared Optics
• Relative Velocity
• Iciam
• Intelligent Imaging Neuroscience
• Biomedical Engineering
• Neuroscience Research
• Quantum Cosmology
• Brain Research

• Aegis combat system
• Air Ministry
• Air traffic control
• Aircraft
• Airport
• Antiaircraft warfare
• Aperture synthesis
• Atmospheric ducting
• Australia
• Aviation
• Azimuth
• AZUSA
• B-1B Lancer
• Baltic Sea
• Boltzmann's constant
• Broadcasting
• C band
• Canada
• Cavity magnetron
• Centimeter
• Centimetre
• Chain Home
• Chain Home Low
• Chirplet transform
• Christian Huelsmeyer
• Coherence (physics)
• Coherer
• Corner reflector
• Crust (geology)
• Death ray
• Diamagnetism
• Dielectric constant
• Diffraction
• Doppler effect
• Doppler radar
• Duplexer
• Earth's atmosphere
• Electromagnetic wave
• Electronic amplifier
• Electronic warfare
• English language
• Figure of the Earth
• Flicker noise
• Fractal
• France
• Frequency
• Frequency hopping
• Frequency modulation
• Gain
• GEMA
• Geologist
• German language
• Germany
• Gigahertz
• Grease pencil
• Guided missiles
• H2S radar
• Heinrich Hertz
• Heterodyne
• High frequency
• History of radar
• Hohentwiel (Radar)
• Hungary
• IEE
• Infrared light
• Interference beat
• Interferometry
• Internet Archive
• Inverse-square law
• Ionosphere
• Italy
• Japan
• Jitter
• K band
• Ka band
• Klystron
• Klystron tube
• Kronstadt
• Ku band
• Kwajalein Atoll
• L band
• Laser
• Leo C. Young
• Lidar
• LIDAR
• Light echo
• Linear polarization
• List of radars
• List of UWB channels
• Look-down shoot-down
• LORAN
• Magnetism
• Magnetron
• Marine radar
• Matched filter
• Megahertz
• Meteor
• Meteorology
• Metre
• MHz
• Microwave
• Mikoyan MiG-31
• Millimetre band
• MIM-104 Patriot
• Mirror
• Missile
• MISTRAM
• MITRE
• Modulation
• Modulator
• Monopulse radar
• Moon
• Motor vehicle
• Nap-of-the-earth
• Nautical mile
• Netherlands
• New Zealand
• NEXRAD
• Nikola Tesla
• Noise figure
• Oboe (navigation)
• Optical resolution
• Parabola
• Pathfinder (RAF)
• Pathloss
• Phased array
• Polarization (waves)
• Pollution Prevention
• Popular Science
• Portal Electronics
• Portal Nautical
• Potomac River
• Pulse compression
• Pulse-Doppler
• Pulse-Doppler radar
• Pulse-doppler radar
• Pulsed power
• Radar
• Radar altimeter
• Radar astronomy
• Radar cross section
• Radar gun
• Radar horizon
• Radar jamming
• Radar mile
• Radar tracker
• Radio
• Radio astronomy
• Radio wave
• Radio waves
• Rayleigh scattering
• Receiver (radio)
• Reflection (physics)
• Refraction
• Refractive index
• Research vessel
• Resonance
• Right angle
• Robert Morris Page
• Robert Watson-Watt
• Rotation
• Rudolf Kühnhold
• S band
• Sand storm
• Scattering
• SCR-270 radar
• Seawater
• Second World War
• Severe weather
• Sidelobe
• Signal noise
• Signal processing
• Sine wave
• Slide rule
• Slotted waveguide
• Solid angle
• Sonar
• South Africa
• Soviet Union
• Space rendezvous
• Spacecraft
• Spectrum analyzer
• Speed
• Speed of light
• SS Normandie
• Stealth aircraft
• Stealth technology
• Sun
• Sunset
• Surveillance
• Thermal noise
• Thinned array curse
• Thunderstorm
• Thyratron
• Tornado
• Track-before-detect
• Transmitter
• Traveling-wave tube
• Turbulence
• UDOP
• UHF
• Ultra-wideband
• Ultraviolet light
• United Air Lines
• United Kingdom
• United States
• United States Army
• United States Navy
• USA
• V band
• Vacuum
• VHF
• Visible light
• W band
• Water vapor
• Waveguide
• Wavelet
• Weather forecast
• Weather radar
• Wetland
• Weyl Heisenberg
• Wikipedia Link rot
• Winter storm
• World War II
• X band
• Émile Girardeau
• 
  

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  Australia
  Australia ( /əˈstreɪljə/), officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent as well as the island of Tasmania and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area. Neighbouring countries include Indonesia, East Timor and Papua New Guinea to the north; the Solomon Islands, Vanuatu and New Caledonia to the north-east; and New Zealand to the south-east.
  For at least 40,000 years before European settlement in the late 18th century, Australia was inhabited by indigenous Australians, who belonged to one or more of roughly 250 language groups. After discovery by Dutch explorers in 1606, Australia's eastern half was claimed by Great Britain in 1770 and settled through penal transportation to the colony of New South Wales from 26 January 1788. The population grew steadily in subsequent decades; the continent was explored and an additional five self-governing Crown Colonies were established.
  
  wn.com/Australia
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  Canada
  Canada ( /ˈkænədə/) is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean. Spanning over 9,900,000 km² (3,800,000 sq mi), Canada is the world's second-largest country by total area, and its common border with the United States is the longest land border in the world.
  The land that is now Canada has been inhabited for millennia by various Aboriginal peoples. Beginning in the late 15th century, British and French colonial expeditions explored, and later settled, along the region's Atlantic coast. France ceded nearly all of its colonies in North America in 1763 after the Seven Years' War. In 1867, with the union of three British North American colonies through Confederation, Canada was formed as a federal dominion of four provinces. This began an accretion of provinces and territories and a process of increasing autonomy; the Canada Act 1982 severed the vestiges of legal dependence on Britain.
  
  wn.com/Canada
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  France
  France (English ⁱ/ˈfræns/ FRANSS or /ˈfrɑːns/ FRAHNSS; French: [fʁɑ̃s] ( listen)), officially the French Republic (French: République française [ʁepyblik fʁɑ̃sɛz]), is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France extends from the Mediterranean Sea to the English Channel and the North Sea, and from the Rhine to the Atlantic Ocean. It is often referred to as l’Hexagone ("The Hexagon") because of the geometric shape of its territory. It is the largest western European country and it possesses the second-largest exclusive economic zone in the world, covering 11,035,000 km² (4,260,000 sq mi), just behind that of the United States (11,351,000 km² / 4,383,000 sq mi).
  Over the past 500 years, France has been a major power with strong cultural, economic, military and political influence in Europe and around the world. During the 17th and 18th centuries, France colonised great parts of North America and Southeast Asia; during the 19th and early 20th centuries, France built the second largest colonial empire of the time, including large portions of North, West and Central Africa, Southeast Asia, and many Caribbean and Pacific Islands.
  
  wn.com/France
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  Germany
  Germany (ⁱ/ˈdʒɜrməni/), officially the Federal Republic of Germany (German: Bundesrepublik Deutschland, pronounced [ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant] ( listen)), is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km² and has a largely temperate seasonal climate. With 81.8 million inhabitants, it is the most populous member state and the largest economy in the European Union. It is one of the major political powers of the European continent and a technological leader in many fields.
  A region named Germania, inhabited by several Germanic peoples, was documented before AD 100. During the Migration Period, the Germanic tribes expanded southward, and established successor kingdoms throughout much of Europe. Beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation while southern and western parts remained dominated by Roman Catholic denominations, with the two factions clashing in the Thirty Years' War, marking the beginning of the Catholic–Protestant divide that has characterized German society ever since. Occupied during the Napoleonic Wars, the rise of Pan-Germanism inside the German Confederation resulted in the unification of most of the German states into the German Empire in 1871 which was Prussian dominated. After the German Revolution of 1918–1919 and the subsequent military surrender in World War I, the Empire was replaced by the Weimar Republic in 1918, and partitioned in the Treaty of Versailles. Amidst the Great Depression, the Third Reich was proclaimed in 1933. The latter period was marked by Fascism and World War II. After 1945, Germany was divided by allied occupation, and evolved into two states, East Germany and West Germany. In 1990 Germany was reunified.
  
  wn.com/Germany
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  Hungary
  Hungary ⁱ/ˈhʌŋɡəri/ (Hungarian: Magyarország [ˈmɒɟɒrorsaːɡ] ( listen)) is a country, which is located in Central Europe. It is situated in the Carpathian Basin and is bordered by Slovakia to the north, Ukraine and Romania to the east, Serbia and Croatia to the south, Slovenia to the southwest and Austria to the west. The country's capital, and largest city, is Budapest. Hungary is a member of the European Union, NATO, the OECD, the Visegrád Group, and is a Schengen state. The official language is Hungarian, also known as Magyar, which is part of the Finno-Ugric group and is the most widely spoken non-Indo-European language in Europe.
  Following a Celt (after c. 450 BC) and a Roman (AD 9 - c. 430) period, the foundation of Hungary was laid in the late 9th century by the Hungarian prince Árpád, whose great-grandson Saint Stephen I was crowned with a crown sent by the pope from Rome in 1000 AD. The Kingdom of Hungary lasted for 946 years, and at various points was regarded as one of the cultural centres of the Western world. After about 150 years of partial Ottoman occupation (1541–1699), Hungary was integrated into the Habsburg Monarchy, and later constituted half of the Austro-Hungarian dual monarchy (1867–1918).
  
  wn.com/Hungary
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  Italy
  Italy ⁱ/ˈɪtəli/ (Italian: Italia [iˈtaːlja]), officially the Italian Republic or the Republic of Italy (Italian: Repubblica italiana), is a unitary parliamentary republic in south-central Europe. To the north, it borders France, Switzerland, Austria and Slovenia along the Alps. To the south, it consists of the entirety of the Italian Peninsula, Sicily, Sardinia–the two largest islands in the Mediterranean Sea–and many other smaller islands. The independent states of San Marino and the Vatican City are enclaves within Italy, while Campione d'Italia is an Italian exclave in Switzerland. The territory of Italy covers some 301,338 km² (116,347 sq mi) and is influenced by a temperate seasonal climate. With 60.6 million inhabitants, it is the fifth most populous country in Europe, and the 23rd most populous in the world.
  Rome, the capital of Italy, was for centuries a political and religious centre of Western civilisation as the capital of the Roman Empire and site of the Holy See. After the decline of the Roman Empire, Italy endured numerous invasions by foreign peoples, from Germanic tribes such as the Lombards and Ostrogoths, to the Byzantines and later, the Normans, among others. Centuries later, Italy became the birthplace of Maritime republics and the Renaissance, an immensely fruitful intellectual movement that would prove to be integral in shaping the subsequent course of European thought.
  
  wn.com/Italy
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  Japan
  Japan ⁱ/dʒəˈpæn/ (Japanese: 日本 Nihon or Nippon; formally 日本国  Nippon-koku or Nihon-koku, literally the State of Japan) is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south. The characters that make up Japan's name mean "sun-origin", which is why Japan is sometimes referred to as the "Land of the Rising Sun".
  Japan is an archipelago of 6,852 islands. The four largest islands are Honshū, Hokkaidō, Kyūshū and Shikoku, together accounting for ninety-seven percent of Japan's land area. Japan has the world's tenth-largest population, with over 127 million people. The Greater Tokyo Area, which includes the de facto capital city of Tokyo and several surrounding prefectures, is the largest metropolitan area in the world, with over 30 million residents.
  Archaeological research indicates that people lived in Japan as early as the Upper Paleolithic period. The first written mention of Japan is in Chinese history texts from the 1st century AD. Influence from other nations followed by long periods of isolation has characterized Japan's history. In the late 19th and early 20th centuries, victory in the First Sino-Japanese War, the Russo-Japanese War and World War I allowed Japan to expand its empire during a period of increasing militarism. The Second Sino-Japanese War of 1937 expanded into part of World War II in 1941, which came to an end in 1945 following the atomic bombings of Hiroshima and Nagasaki. Since adopting its revised constitution in 1947, Japan has maintained a unitary constitutional monarchy with an emperor and an elected parliament called the Diet.
  
  wn.com/Japan
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  Kronstadt
  Kronshtadt (Russian: Кроншта́дт), also spelled Kronstadt, Cronstadt (German: Krone for "crown" and Stadt for "city"; Finnish: Retusaari), is a municipal town in Kronshtadtsky District of the federal city of St. Petersburg, Russia, located on Kotlin Island, 30 kilometers (19 mi) west of Saint Petersburg proper near the head of the Gulf of Finland. Population: 42,999 (2010 Census preliminary results); 43,385 (2002 Census).
  It is also St. Petersburg's main seaport. In March 1921 it was the site of the Kronstadt rebellion.
  Traditionally, the seat of the Russian admiralty and the base of the Russian Baltic Fleet were located in Kronstadt guarding the approaches to Saint Petersburg. The historic centre of the city and its fortifications are part of the World Heritage Site Saint Petersburg and Related Groups of Monuments.
  Kronstadt has been a place of pilgrimage for Orthodox Christians for many years due to the holy memory of Saint John of Kronstadt. Bus and water tours to Kronstadt are taken daily from Saint Petersburg
  
  wn.com/Kronstadt
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  Netherlands
  The Netherlands (ⁱ/ˈnɛðərləndz/; Dutch: Nederland [ˈneːdə(r)lɑnt] or [ˈneɪ̯də(r)lɑnt] ( listen); West Frisian: Nederlân; Papiamento: Hulanda) is a constituent country of the Kingdom of the Netherlands, located mainly in North-West Europe and with some islands in the Caribbean. Mainland Netherlands borders the North Sea to the north and west, Belgium to the south, and Germany to the east, and shares maritime borders with Belgium, Germany and the United Kingdom. It is a parliamentary democracy organised as a unitary state. The country capital is Amsterdam and the seat of government is The Hague. The Netherlands in its entirety is often referred to as Holland, although North and South Holland are actually only two of its twelve provinces (a case of pars pro toto; see terminology of "the Netherlands").
  
  wn.com/Netherlands
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  New Zealand
  New Zealand (Māori: Aotearoa) is an island country located in the southwestern Pacific Ocean. The country geographically comprises two main landmasses ‒ that of the North and South Islands ‒ as well as numerous smaller islands. New Zealand is situated some 1,500 kilometres (900 mi) east of Australia across the Tasman Sea and roughly 1,000 kilometres (600 mi) south of the Pacific island nations of New Caledonia, Fiji, and Tonga. Because of its remoteness, it was one of the last lands to be settled by humans.
  During its long isolation, New Zealand developed a distinctive biodiversity of both animal and plant life. Most notable are the large number of unique bird species, many of which became extinct after the arrival of humans and introduced mammals. With a mild maritime climate, the land was mostly covered in forest. The country's varied topography and its sharp mountain peaks owe much to the tectonic uplift of land and volcanic eruptions caused by the Pacific and Indo-Australian Plates clashing beneath the earth's surface.
  
  wn.com/New_Zealand
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  South Africa
  Coordinates: 30°S 25°E / 30°S 25°E / -30; 25
  South Africa, officially the Republic of South Africa, is a country located at the southern tip of Africa. It is divided into nine provinces and has 2,798 kilometres (1,739 mi) of coastline. To the north of the country lie the neighbouring territories of Namibia, Botswana and Zimbabwe; to the east are Mozambique and Swaziland; while Lesotho is an enclave surrounded by South African territory.
  South Africa is multi-ethnic and has diverse cultures and languages. Eleven official languages are recognised in the constitution. Two of these languages are of European origin: South African English and Afrikaans, a language which originated mainly from Dutch that is spoken by the majority of white and Coloured South Africans. Though English is commonly used in public and commercial life, it is only the fifth most-spoken home language. All ethnic and language groups have political representation in the country's constitutional democracy comprising a parliamentary republic; unlike most parliamentary republics, the positions of head of state and head of government are merged in a parliament-dependent President.
  
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  Soviet Union
  The Soviet Union (Russian: Советский Союз, tr. Sovetsky Soyuz), officially the Union of Soviet Socialist Republics (USSR; Russian: Сою́з Сове́тских Социалисти́ческих Респу́блик, tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik; IPA: [sɐˈjus sɐˈvʲetskʲɪx sətsɨəlʲɪˈstʲitɕɪskʲɪx rʲɪsˈpublʲɪk] ( listen); abbreviated СССР, SSSR), was a constitutionally socialist state that existed in Eurasia between 1922 and 1991.
  The Soviet Union was a single-party state ruled by the Communist Party from its foundation until 1990. A union of 15 subnational Soviet republics, the Soviet state was structured under a highly centralized government and economy.
  The Russian Revolution of 1917 caused the downfall of the Russian Empire. Following the Russian Revolution, there was a struggle for power between the Bolshevik party, led by Vladimir Lenin, and the anti-communist White movement. In December 1922, the Bolsheviks won the civil war, and the Soviet Union was formed with the merger of the Russian Soviet Federative Socialist Republic, the Transcaucasian Socialist Federative Soviet Republic, the Ukrainian Soviet Socialist Republic and the Byelorussian Soviet Socialist Republic.
  
  wn.com/Soviet_Union
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  United Kingdom
  The United Kingdom of Great Britain and Northern Ireland (commonly known as the United Kingdom, the UK, or Britain) is a sovereign state located off the north-western coast of continental Europe. The country includes the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands. Northern Ireland is the only part of the UK that shares a land border with another sovereign state—the Republic of Ireland. Apart from this land border the UK is surrounded by the Atlantic Ocean, the North Sea, the English Channel and the Irish Sea.
  The United Kingdom is a unitary state governed under a constitutional monarchy and a parliamentary system, with its seat of government in the capital city of London. It is a country in its own right and consists of four countries: England, Northern Ireland, Scotland and Wales. There are three devolved administrations, each with varying powers, based in Belfast, Edinburgh and Cardiff, the capitals of Northern Ireland, Scotland, and Wales. Associated with the UK, but not constitutionally part of it, are three Crown Dependencies. The United Kingdom has fourteen overseas territories. These are remnants of the British Empire which, at its height in 1922, encompassed almost a quarter of the world's land surface and was the largest empire in history. British influence can still be observed in the language, culture and legal systems of many of its former territories.
  
  wn.com/United_Kingdom
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  United States
  The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.
  At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.
  
  wn.com/United_States
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  USA
  The United States of America (commonly abbreviated to the United States, the U.S., the USA, America, and the States) is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its forty-eight contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south. The state of Alaska is in the northwest of the continent, with Canada to the east and Russia to the west, across the Bering Strait. The state of Hawaii is an archipelago in the mid-Pacific. The country also possesses several territories in the Pacific and Caribbean.
  At 3.79 million square miles (9.83 million km²) and with over 312 million people, the United States is the third or fourth largest country by total area, and the third largest by both land area and population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy, with an estimated 2011 GDP of $15.1 trillion (22% of nominal global GDP and over 19% of global GDP at purchasing-power parity). Per capita income is the world's sixth-highest.
  
  wn.com/USA
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  Winter storm
  A winter storm is an event in which the dominant varieties of precipitation are formed that only occur at low temperatures, such as snow or sleet, or a rainstorm where ground temperatures are low enough to allow ice to form (i.e. freezing rain). In temperate continental climates, these storms are not necessarily restricted to the winter season, but may occur in the late autumn and early spring as well. Very rarely, they may form in summer, though it would have to be an abnormally cold summer, such as the summer of 1816 in the Northeast United States of America.
  Snowstorms are storms where large amounts of snow fall. Snow is less dense than liquid water, by a factor of approximately 10 at temperatures slightly below freezing, and even more at much colder temperatures.^{[citation needed]} Therefore, an amount of water that would produce 0.8 in (20 mm) of rain could produce at least 8 in (20 cm) of snow. Two inches (5 cm) of snow is enough to create serious disruptions to traffic and school transport (because of the difficulty to drive and maneuver the school buses on slick roads). This is particularly true in places where snowfall is atypical but heavy accumulating snowfalls can occur (e.g., Dallas, Atlanta, Seattle, London, Dublin, Canberra, Vancouver and Las Vegas). In places where snowfall is typical, such as Utica, Kenosha, Milwaukee, Minneapolis, Detroit, Bismarck, Fargo, Rapid City, Sioux Falls, Omaha, St. Louis, Des Moines, Wichita, Denver, Albuquerque, Flagstaff, Ottawa, Montreal, Quebec City, Portland, Chicago, Syracuse, Buffalo, Cincinnati, Cleveland, Columbus, Philadelphia, Pittsburgh, and Toronto, such small snowfalls are rarely disruptive, because of effective snow and ice removal by municipalities, increased use of four-wheel drive and snow tires, and drivers being more used to winter conditions. Snowfalls in excess of 6 inches (15 cm) are usually universally disruptive.
  
  wn.com/Winter_storm

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  Heinrich Hertz
  Heinrich Rudolf Hertz (22 February 1857 – 1 January 1894) was a German physicist who clarified and expanded James Clerk Maxwell's electromagnetic theory of light, which was first demonstrated by David Edward Hughes using non-rigorous trial and error procedures. Hertz is distinguished from Maxwell and Hughes because he was the first to conclusively prove the existence of electromagnetic waves by engineering instruments to transmit and receive radio pulses using experimental procedures that ruled out all other known wireless phenomena. The scientific unit of frequency — cycles per second — was named the "hertz" in his honor.
  Hertz was born in Hamburg, then a sovereign state of the German Confederation, into a prosperous and cultured Hanseatic family. His father, David Gustav Hertz, was a writer and later a senator. His mother was the former Anna Elisabeth Pfefferkorn. His paternal great-grandfather, David Wolff Hertz (1757–1822), fourth son of Benjamin Wolff Hertz, moved to Hamburg in 1793, where he made his living as a jeweller; he and his wife Schöne Hertz (1760–1834) were buried in the former Jewish cemetery in Ottensen. Their first son, Wolff Hertz (1790–1859), was chairman of the Jewish community. Hertz' paternal grandfather, Heinrich David Hertz (1797–1862), was a respected businessman, and his paternal grandmother, Betty Oppenheim, was the daughter of the banker Salomon Oppenheim, from Cologne. Hertz's father and paternal grandparents converted from Judaism to Christianity. His mother's family was Lutheran.
  
  wn.com/Heinrich_Hertz
• Leo C. Young
  Leo C. Young (12 January 1891-16 January 1981) was an American radio engineer who had many accomplishments during a long career at the U.S. Naval Research Laboratory. Although self-educated, he was a member of a small, creative team that is generally credited with developing the world's first true radar system.
  Leo Crawford Young grew up on a farm near Van Wert, Ohio. Although his formal education stopped with high-school, he was self-educated in early radio technology. He built his first crystal radio when he was 14 years old. To receive stations, he learned the Morse Code, and soon built his own spark-gap transmitter, joining the ranks of amateur radio enthusiasts in the pre-license days. (Young was later issued the call sign W3WV). After high school, he used his ability with Morse code to gain employment as a railroad telegrapher. In 1913, he joined the Naval Communications Reserves and set up the central control station for the Navy-Amateur Network.
  The Navy Reserve was activated at the start of World War I in 1917. Young was assigned to the District Communications Office at Great Lakes, Illinois, where Albert Hoyt Taylor was the Director. Taylor was also an amateur radio operator (call sign 9YN), and he and Young began a personal and professional relationship that existed for the rest of their lives. In 1918, Taylor was sent to the former Marconi Communications Station in Belmar, New Jersey, to head the Navy's Trans-Atlantic Communications System, and then went to the Navy's Aircraft Radio Laboratory (ARL) at Anacostia, Washington, D.C.; Taylor arranged for Young to follow him in both of these assignments. In 1919, both Young and Taylor returned to civilian life, but stayed as employees at the ARL
  
  wn.com/Leo_C._Young
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  Nikola Tesla
  Nikola Tesla (Serbian Cyrillic: Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, physicist, mechanical engineer, electrical engineer, and futurist. He was an important contributor to the use of commercial electricity, and is best known for developing the modern alternating current (AC) electrical supply system. His many revolutionary developments in the field of electromagnetism in the late 19th and early 20th centuries were based on the theories of electromagnetic technology discovered by Michael Faraday. Tesla's patents and theoretical work also formed the basis of wireless communication and the radio.
  Born in the village of Smiljan (now part of Gospić, present day Croatia), Tesla was a subject of the Austrian Empire by birth and later became an American citizen. Because of his 1894 demonstration of short range wireless communication through radio and as the eventual victor in the "War of Currents", he was widely respected as one of the greatest electrical engineers who worked in America. He pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. In the United States during this time, Tesla's fame rivaled that of any other inventor or scientist in history or popular culture. Tesla demonstrated wireless energy transfer to power electronic devices in 1891, and aspired to intercontinental wireless transmission of industrial power in his unfinished Wardenclyffe Tower project.
  
  wn.com/Nikola_Tesla
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  Robert Watson-Watt
  Sir Robert Alexander Watson-Watt, KCB, FRS, FRAeS (13 April 1892 – 5 December 1973) is considered by many to be the "inventor of radar".^{[citation needed]} (The hyphenated name is used herein for consistency, although this was not adopted until he was knighted in 1942.) Development of radar, initially nameless, was first started elsewhere but greatly expanded on 1 September 1936 when Watson-Watt became Superintendent of a new establishment under the British Air Ministry, Bawdsey Research Station located in Bawdsey Manor, near Felixstowe, Suffolk. Work there resulted in the design and installation of aircraft detection and tracking stations called Chain Home along the East and South coasts of England in time for the outbreak of World War II in 1939. This system provided the vital advance information that helped the Royal Air Force win the Battle of Britain.
  Born in Brechin, Angus, Scotland, Watson-Watt was a descendant of James Watt, the famous engineer and inventor of the practical steam engine. After attending Damacre Primary School and Brechin High School, he was accepted to University College, Dundee (which was then part of the University of St Andrews but became the University of Dundee in 1967). Watt had a successful time as a student, winning the Carnelley Prize for Chemistry and a class medal for Ordinary Natural Philosophy in 1910.
  
  wn.com/Robert_Watson-Watt
• Rudolf Kühnhold
  Rudolf Kühnhold (1903–1992) was an experimental physicist who is often given credit for initiating research that led to the Funkmessgerät (radio measuring device – radar) in Germany.
  A native of Schwallungen in the Meiningen district of Thuringia, Kühnhold received his higher education in physics at the University of Göttingen. After graduating with a Ph.D. in physics in 1928, he took a position at the Nachrichtenmittel-Versuchsanstalt (NVA – Experimental Institute of Communication Systems) of the Kriegsmarine (Germany Navy) in Kiel. There he worked in acoustical research, specifically in Unterwasser-Schall (sonar) with the objective of improving the accuracy of detection of vessels using near-surface, underwater signals. Although his efforts led to a patent, and in 1931, he was promoted to Scientific Director of the NVA, he became convinced that the desired accuracy would only be attained by using electromagnetic, rather than acoustical, techniques.
  The first demonstration of radio signals for detecting ships was made in 1904 by Christian Hülsmeyer, with an apparatus called the Telemobilskop (Telemobiloscope). This device, however, could neither distinguish between multiple targets nor directly measure the distance to a target, and was thus not accepted as of practical value. Other similar sets had come forth in the intervening decades, but none were successful.
  
  wn.com/Rudolf_Kühnhold

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