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Entertainment10 'dying' rivers of America (Part 1)
Do you know more than 250,000 large and small rivers exist in the Americas? It is a very large number and it is inevitable that one of those rivers is polluted.
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Why are diesel engines not used in small cars?
Why does every lock have a 'mysterious' small hole at the bottom?
Why is Mount Everest so attractive to so many people?
Why will the Earth never be 'swallowed' if one day the Sun turns into a black hole?
Record selling price for the gold watch of the richest passenger on the Titanic
Humans' heat tolerance limit is not as high as we think
Atomic clocks are off by only 300 trillionths of a second every day
China wants to bring Mars samples before the US
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