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EntertainmentTotal whale 'population inventory'
July 23 is the World Day of whales and dolphins. This day has been declared more than a quarter of a century ago, when officially banned the commercial fishing of whales.
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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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