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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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