Chang

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668 published items.

Why are we so sad in the fall?
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Why are we so sad in the fall?

In the fall, the weather affects hormonal production as well as physiological functions, making people sad and tired.

December 18, 2018
How was the winter Olympic ice rink made?
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How was the winter Olympic ice rink made?

The Korean Pyeongchang Winter Olympics is about to take place from February 9, and the organizers are rushing to the final preparations.

December 18, 2018
What is a whirlpool?  Whirlpool appears like?
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What is a whirlpool? Whirlpool appears like?

The river water is running fast, when it comes to the abutment, it is blocked, so it has to step back. But the back is a stream of water flowing in, pulling it along.

December 18, 2018