Romans used a plant called Silphium as contraception. They had so much sex that they drove it into extinction.
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Sunflowers can be used to clean up radioactive waste.
17
Touching a teddy bear can make people feel less lonely.
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The exact cause of death and burial site of Genghis Khan is unknown, because all of the 2000 funeral guests and 800 soldiers were killed in order to preserve the secret.
16
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Those who get out of bed by 7am are more likely to be thinner and happier.
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