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Did you know?

Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.

Did you know?

The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

This chart shows the various lines of responsibility and how they differ in presidential and parliam This chart shows the various lines of responsibility and how they differ in presidential and parliam
The world attempted to deal with Somalia as if it were a real country but painfully learned that Som The world attempted to deal with Somalia as if it were a real country but painfully learned that Som
In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con In 2009, historian Woody Holton described how Abigail Adams shrewdly invested in the Continental Con
Older Adults Benefit from Good Nutrition and Physical Activity Older adults Older Adults Benefit from Good Nutrition and Physical Activity Older adults
A government of Ontario 364-day T-bills with a face value of $50 000 were purchased on January ... A government of Ontario 364-day T-bills with a face value of $50 000 were purchased on January ...
The constitutional division of Powers Between the National Government and the States The constitutional division of Powers Between the National Government and the States
Video: Optic Nerve and Optic Disk Animation (Part 2 of 2)

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