Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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There are 60,000 miles of blood vessels in every adult human.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Differences in embryonic development between protostomes and deuterostomes.