On October 3rd, 2017, it was announced that the Nobel Prize in Physics 2017 was divided, one half awarded to Rainer Weiss, the other half jointly to Barry C. Barish and Kip S. Thorne “for decisive contributions to the LIGO detector and the observation of gravitational waves”. In this article, I shall try to answer the following questions: What is this scientific discovery? What is its relationship with the development of modern physics? What is its relationship with Einstein? Is gravitational wave useful? Is there any way to shield gravitational waves? What is the future of the detection of and research on gravitational waves? What are the future programs of gravitational wave detection in China?