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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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.