In the 20th century, there have been three influenza pandemics in the world: the “Spanish influenza” in 1918-1919, the “Asian influenza” in 1957-1958, and the…

　　As early as the morning of November 7, 1935, two marine zoologists from Britain, Mike Kee and Alto, drove a small boat named Valhalla for…

　　In 1959, Captain Ru Peter, the editor of the Blue Book of the US Air Force Program, wrote: At the end of World War II,…