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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.