Colonization (or colonisation) occurs whenever any one or more species populate an area. The term, which is derived from the Latin colere, "to inhabit, cultivate, frequent, practice, tend, guard, respect", originally referred to humans. During the 19th century, biogeographers appropriated the term to also describe the activities of birds, bacteria, or plant species. Human colonization is a narrower category than the related concept of colonialism. Colonization refers strictly to migration, for example, to settler colonies, trading posts, and plantations, while colonialism deals with this as well as the ruling of new territories' existing peoples.

In ancient times, maritime nations such as the city-states of Greece and Phoenicia often established colonies to farm what they saw as uninhabited land. In classical times, land suitable for farming was often claimed by migratory "barbarian tribes" who lived by hunting and gathering. To ancient Greeks and Phoenicians, the land was regarded as simply vacant. However this does not mean that conflict did not exist between the colonizers and native peoples. Greeks and Phoenicians also established colonies with the intent of regulating and expanding trade throughout the Mediterranean and Middle East.

Carl Edward Sagan ( /ˈseɪɡɪn/; November 9, 1934 – December 20, 1996) was an American astronomer, astrophysicist, cosmologist, author, science popularizer, and science communicator in astronomy and natural sciences. He published more than 600 scientific papers and articles and was author, co-author or editor of more than 20 books. He advocated scientifically skeptical inquiry and the scientific method, pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).

Sagan is known for his popular science books and for the award-winning 1980 television series Cosmos: A Personal Voyage, which he narrated and co-wrote. The book Cosmos was published to accompany the series. Sagan wrote the novel Contact, the basis for a 1997 film of the same name.

Carl Sagan was born in Brooklyn, New York, to a Ukrainian Jewish family. His father, Sam Sagan, was an immigrant garment worker from Kamenets-Podolsk, Ukraine; his mother, Rachel Molly Gruber, a housewife. Carl was named in honor of Rachel's biological mother, Chaiya Clara, in Sagan's words, "the mother she never knew." Sagan graduated from Rahway High School in Rahway, New Jersey, in 1951.

Buzz Aldrin, Sc.D. (born Edwin Eugene Aldrin, Jr., January 20, 1930) is an American mechanical engineer, retired United States Air Force pilot and astronaut who was the lunar module pilot on Apollo 11, the first manned lunar landing in history. On July 20, 1969, he was the second human being to set foot on the moon, following mission commander Neil Armstrong.

Aldrin was born in Glen Ridge, New Jersey, to Edwin Eugene Aldrin, Sr., a career military man, and his wife Marion (née Moon). He is of Scottish, Swedish, and German ancestry. After graduating from Montclair High School in 1946, Aldrin turned down a full scholarship offer from Massachusetts Institute of Technology, and went to the U.S. Military Academy at West Point. The nickname "Buzz" originated in childhood: the younger of his two elder sisters mispronounced "brother" as "buzzer", and this was shortened to Buzz. Aldrin made it his legal first name in 1988.

Aldrin graduated third in his class at West Point in 1951 with a bachelor of science degree in mechanical engineering. He was commissioned as a second lieutenant in the U.S. Air Force and served as a jet fighter pilot during the Korean War. He flew 66 combat missions in F-86 Sabres and shot down two Mikoyan-Gurevich MiG-15 aircraft. The June 8, 1953, issue of LIFE magazine featured gun camera photos taken by Aldrin of one of the Russian pilots ejecting from his damaged aircraft.

Sidney K. "Sid" Meier (born February 24, 1954) is a Canadian-American programmer and designer of several popular strategy video games and simulation video games, most notably Civilization. Meier co-founded MicroProse in 1982 and is a Director of Creative Development for computer game developer Firaxis Games, which he co-founded with Jeff Briggs and Brian Reynolds in 1996. He has won several prestigious accolades for his contributions to the computer games industry.

Sid Meier was born in Sarnia, Ontario, Canada. He graduated from the University of Michigan.

Meier founded MicroProse together with Bill Stealey in 1982. MicroProse initially developed flight simulator video games, such as Silent Service and F-19 Stealth Fighter. In 1987, the company released Sid Meier's Pirates!, which also began a trend of placing Meier's name in the titles of his games. Meier later explained that the inclusion of his name was because of the dramatic departure in the design of Pirates! compared to the company's earlier games. Stealey decided that it would improve the company's branding, believing that it would make those who purchased the flight simulators more likely to play Pirates!. After the release of F-19 Stealth Fighter, Meier decided to focus on developing strategy games. He later said, "Everything I thought was cool about a flight simulator had gone into that game." Inspired by SimCity and Empire!, Meier created Railroad Tycoon and later the game series for which he is most widely recognized, Civilization, although he designed only the first installment. Meier eventually left MicroProse and in 1996 founded Firaxis Games along with veteran designer and gaming executive Jeff Briggs. Today Firaxis makes strategy games, many of which are follow-ups to Meier titles, such as Civilization V and Pirates!. In 1996 he was awarded US Patent 5,496,962 for a "System for Real-Time Music Composition and Synthesis" used in a product called "CPU Bach".

Milton Friedman (July 31, 1912 – November 16, 2006) was an American economist, statistician, and author who taught at the University of Chicago for more than three decades. He was a recipient of the Nobel Memorial Prize in Economic Sciences, and is known for his research on consumption analysis, monetary history and theory, and the complexity of stabilization policy. As a leader of the Chicago school of economics, he influenced the research agenda of the economics profession. A survey of economists ranked Friedman as the second most popular economist of the twentieth century behind John Maynard Keynes, and The Economist described him as "the most influential economist of the second half of the 20th century…possibly of all of it."

Friedman's challenges to what he later called "naive Keynesian" (as opposed to New Keynesian) theory began with his 1950s reinterpretation of the consumption function, and he became the main advocate opposing activist Keynesian government policies. In the late 1960s he described his own approach (along with all of mainstream economics) as using "Keynesian language and apparatus" yet rejecting its "initial" conclusions. During the 1960s he promoted an alternative macroeconomic policy known as "monetarism". He theorized there existed a "natural" rate of unemployment, and argued that governments could increase employment above this rate (e.g., by increasing aggregate demand) only at the risk of causing inflation to accelerate. He argued that the Phillips curve was not stable and predicted what would come to be known as stagflation. Friedman argued that, given the existence of the Federal Reserve, a constant small expansion of the money supply was the only wise policy.