Nowadays, with the development of technology, the market competition is fierce and people feel great pressure. In order to improve the working efficiency, they force themselves to work overtime. However, they are not machine and need to slo... [ 阅读全文 ]
Stephen Hawking is one of the great scientists in the history, whose brilliant idea about universe opens the door for people to get to know the universe. Hawking is also a humorous person that he has showed in the movies and the public lov... [ 阅读全文 ]