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 most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
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In zero gravity, a candle's flame is round and blue.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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The use of emoticons affects our corresponding brain areas and can actually trigger emotions.
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