There’s a scientific reason why it’s smart to pack that extra sweater when you’re headed to the mountains. Temperatures drop steadily as altitude increases, at least in the first layer of atmosphere known as the troposphere. Temperature readings in the atmosphere’s other three layers, which are beyond the reach of any mountain peak, also change with increasing altitude, but they change at significantly different rates, and they don't always decrease.
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Papermaking, printing, gunpowder and the compass - the four great inventions of ancient China-are significant contributions of the Chinese nation to world civilization. China was the first nation to invent paper. ... Printed in Tang DynastyA Buddhist sutra is the first book in the world with a verifiable date of printing.
Correct me if I'm wrong though I hope this helps