There are more nerve cells in one human brain than there are stars in the Milky Way.
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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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There are 60,000 miles of blood vessels in every adult human.
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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.
Animal Cell
The egg cell
Consuming Lithosphere at Convergent Plate Boundaries