North

North is a noun, adjective, or adverb indicating direction or geography. North is one of the four cardinal directions or compass points. It is the opposite of south and is perpendicular to east and west.

Etymology

The word north is related to the Old High German nord, both descending from the Proto-Indo-European unit ner-, meaning "down" (or "under"). (Presumably a natural primitive description of its concept is "to the left of the rising sun".)

The Latin word borealis comes from the Greek boreas "north wind, north", which, according to Ovid, was personified as the son of the river-god Strymon, the father of Calais and Zetes. Septentrionalis is from septentriones, "the seven plow oxen", a name of Ursa Maior. The Greek arktikos is named for the same constellation, and is the derivation of the English word "Arctic".

Other languages have sometimes more interesting derivations. For example, in Lezgian, kefer can mean both 'disbelief' and 'north', since to the north of the Muslim Lezgian homeland there are areas formerly inhabited by non-Muslim Caucasian and Turkic peoples. In many languages of Mesoamerica, "north" also means "up". In Hungarian the word for north is észak, which is derived from éjszaka ("night"), since above the Tropic of Cancer, the Sun never shines from the north.

Blood

Blood is a bodily fluid in humans and other animals that delivers necessary substances such as nutrients and oxygen to the cells and transports metabolic waste products away from those same cells. When it reaches the lungs, gas exchange occurs when carbon dioxide is diffused out of the blood into the pulmonary alveoli and oxygen is diffused into the blood. This oxygenated blood is pumped to the left hand side of the heart in the pulmonary vein and enters the left atrium. From here it passes through the mitral valve, through the ventricle and taken all around the body by the aorta. Blood contains antibodies, nutrients, oxygen and much more to help the body work.

In vertebrates, it is composed of blood cells suspended in blood plasma. Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume), and contains dissipated proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), and blood cells themselves. Albumin is the main protein in plasma, and it functions to regulate the colloidal osmotic pressure of blood. The blood cells are mainly red blood cells (also called RBCs or erythrocytes), white blood cells (also called WBCs or leukocytes) and platelets. The most abundant cells in vertebrate blood are red blood cells. These contain hemoglobin, an iron-containing protein, which facilitates oxygen transport by reversibly binding to this respiratory gas and greatly increasing its solubility in blood. In contrast, carbon dioxide is almost entirely transported extracellularly dissolved in plasma as bicarbonate ion.

Heroes

Heroes may refer to:

Film

Television

Series

Episodes

Literature

Coat of arms

A coat of arms is a unique heraldic design on an escutcheon (i.e. shield), surcoat, or tabard. The coat of arms on an escutcheon forms the central element of the full heraldic achievement which consists of shield, supporters, crest, and motto. The design is a symbol unique to an individual person or family (except in the UK), corporation, or state.

History

The ancient Romans used similar insignia on their shields, but these identified military units rather than individuals. The first evidence of medieval coats of arms is found in the 11th century Bayeux Tapestry in which some of the combatants carry shields painted with crosses. Coats of arms came into general use by feudal lords and knights in battle in the 12th century. By the 13th century, arms had spread beyond their initial battlefield use to become a flag or emblem for families in the higher social classes of Europe, inherited from one generation to the next. Exactly who had a right to use arms, by law or social convention, varied to some degree between countries. In the German-speaking regions both the aristocracy and "burghers" (non-noble free citizens) used arms, while in most of the rest of Europe they were limited to the aristocracy. The use of arms spread to the clergy, to towns as civic identifiers, and to royally chartered organizations such as universities and trading companies. Flags developed from coats of arms, and the arts of vexillology and heraldry are closely related. The coats of arms granted to commercial companies are a major source of the modern logo.

Liberty or Death

Liberty or Death is a slogan made famous during the independence struggle of several countries, notably including the United States of America, Brazil, Bulgaria, Greece, the Republic of Macedonia, Ireland, and Uruguay.

It can refer to: