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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China's capital Beijing means "Gate".
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Tickling was a form of torture used in ancient China on nobility because it left no mark and recovery was quick.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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In Hong Kong, a betrayed wife is legally allowed to kill her adulterous husband, but may only do so with her bare hands. (The husband's lover, on the other hand, may be killed in any manner desired.)
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Passengers on the Beijing subway can pay with plastic bottles.
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