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EntertainmentThe 500-year journey rises to the world domination position of a pencil
Not only is the learning tool from early childhood to school, but pencil is also a daily tool of architects, designers, painters, ...Video: 6 tips with pencil sharpeners you may not know
In everyone's mind, pencil sharpening only has one function: cutting blunt pencils or breaking them right? In fact it is not.
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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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