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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.