Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
A taxonomy of primate social systems. Larger symbols indicate adults.