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.
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The lifespan of mammals is about 1 and a half billion heartbeats.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
6
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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The oldest recorded elephant lived for 82 years.
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