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Dolphins are mammals that live in the famous ocean friendly, mischievous and belong to one of the smartest species on earth. So how smart is dolphin?How do we know which animal is the smartest in the world?
No member of the animal kingdom can take algebra tests or write an essay that reaches an A.
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Can carp live 10 years in a tank without feeding?
Why do Italy and Switzerland have to redraw the border?
Japanese bullet train accident-free for 60 years
The world's most crowded apartment building: Can accommodate up to 30,000 people, the view inside is overwhelming
World's oldest wine jar contains cremated human bones
America catches strange signal from 1.3 billion light years away from Earth
Two black holes closest to Earth discovered, of a kind never seen before
Solar sails help spacecraft reach Mars in 26 days
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