"Life on Earth" redirects here. For the BBC series, see Life on Earth (TV series). See also: Organism (philosophy) Life on EarthFossil range: Late Hadean - Recent These Escherichia coli cells provide an ex[...]

History Main article: History of the periodic table In Ancient Greece, the influential Greek philosopher Aristotle proposed that there were four main elements: air, fire, earth and water. All of these elem[...]

From Wikipedia, the free encyclopedia Jump to: navigation, search "The Periodic Table" redirects here. For the book by Primo Levi, see The Periodic Table (book). For a diagram of the periodic table, see st[...]