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EntertainmentVideo: American super-fast shells
Described asThe United States built guns that fired bullets 7 times faster than sound
The US military has successfully tested a new dangerous super weapon, which can fire artillery shells at 7 times the speed of sound.
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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
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