The offspring of two sets of identical twins are legally cousins but genetically siblings.
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Vicks inhalers can cause you to test positive for Meth on drug tests.
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If the population of China walked past you, in single file, the line would never end because of the rate of reproduction.
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There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
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Foreign accent syndrome is a rare brain disorder which causes people to speak in a foreign accent involuntarily.
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