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EntertainmentBillions of alien civilizations have existed
Scientists calculate and almost certainly many extraterrestrial civilizations have existed in this universe.Prove that humans are not alone in the universe by mathematics
Mathematicians who have just answered the eternal question of mankind are: Are we human beings alone in the universe?
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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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