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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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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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Your heart beats over 36 million times a year.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Ancestral versus shared derived characters involving morphological traits.
Aerial and close-up views of a large biodiversity experiment in Cedar Creek, Minnesota. Each of the
Two women having a conversation using American Sign Language.