The human body produces and destroys 15 million blood cells every second.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
Two women having a conversation using American Sign Language.
Anterior and posterior views of the body illustrating the location of various body regions.
Radio Views of Saturn
Posterior views of H. erectus, Neandertal, and modern H. sapiens show differences in vault shape.
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
Utagawa Hiroshige (Ando), Moon Pine, Ueno, No. 89 from One Hundred Famous Views of Edo