Vaccines prevent between 2.5 and 4 million deaths every year.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Relatively simple changes in Hox genes control limb formation in tetrapods.
Emerging adults often feel adult in some ways but not others.
Control of the anterior and posterior pituitary by the hypothalamus.