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President Richard M. Nixon smiles and gives the victory sign as he boards the White House helicopter after his resignation on August 9, 1974 in Washington, D.C.

Timeline of the 1970s

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

6 Animals We Ate Into Extinction

Germans from East and West stand on the Berlin Wall in front of the Brandenburg Gate in the November 10, 1989, photo, one day after the wall opened.

Timeline of the 1980s

Eye. Eyelash. Eyeball. Vision.

7 Vestigial Features of the Human Body

US Marines firing at Fallujah, Iraq, during the Second Battle of Fallujah in November 2004. Operation Iraqi Freedom, Iraq War.

Timeline of the 2000s

Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

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logical relation transitive law symmetry binary relation ordering reflexivity commutative law distributive law equivalence relation associative law formal system theorem argument history of logic formal logic applied logic metalogic modern logic ancient logic philosophy of logic