An automobile (also motor car or simply car) is a wheeled passenger vehicle that carries its own motor. Most definitions of the term specify that automobiles are designed to run primarily on roads, to have seating for one to seven people, to typically...
Lire la suite
Humans, or human beings, are bipedal primates belonging to the mammalian species, Homo sapiens (Latin: "wise man" or "knowing man") in the family Hominidae (the great apes).[1][2] Humans have a highly developed brain capable of abstract reasoning, language,...
Lire la suite
Why is the Sky Blue? If you were to travel 20 miles or so above the Earth's surface, the sky would appear black. What happens during light's descent to Earth that makes the sky take on a wonderful azure hue? "White" sunlight passes through our atmosphere,...
Lire la suite
Fact or Fiction? A big diference Climate fluctuates naturally between warm and cold periods. but the 20th and 21th century has seen the greatest warming in at least a thousand years, and natural forces can't account for it all. The rise in co2s and other...
Lire la suite
L'eau (H2O, HOH) est la molécule la plus abondante à la surface de la Terre, composant 70-75% de la surface de la Terre à l'état liquide et solide en plus de la trouver dans l'atmosphère sous forme de vapeur. Elle est en équilibre dynamique entre l'état...
Lire la suite
In chemistry, a metal (Greek: Metallon) is an element that readily loses electrons to form positive ions (cations) and has metallic bonds between metal atoms. Metals form ionic bonds with non-metals. Metals are sometimes described as a lattice of positive...
Lire la suite