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Did you know?
The average adult has about 21 square feet of skin.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
![Left: This web was woven by a 17-day-old spider, showing regular patterns. Right: This web was woven](https://biology-forums.com/gallery/47/medium_12359_03_04_12_3_07_11.jpeg)
![Variation in coat pattern in zebras. The patterns show progressively more black left to right and to](https://biology-forums.com/gallery/47/medium_27759_23_04_12_7_25_57.jpeg)