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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Passengers on the Beijing subway can pay with plastic bottles.
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China's capital Beijing means "Gate".
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There's a company in China that allows you to hire someone to stand in line for you for $3-$5 an hour.
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Scientists at the Zhejiang University in China have developed an ultra-light material known as carbon aerogel.
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