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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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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.

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Thyroid conditions may make getting pregnant impossible.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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