Tornadoes are some of the most destructive forces of nature. Learn how tornadoes form, how they are rated, and the country where the most intense tornadoes occur.
COSMOS: POSSIBLE WORLDS is helmed 由 Carl Sagan’s collaborator Ann Druyan, who boldly carries the torch 前锋, 期待 with the 3rd season of the most beloved science 显示 on the planet.
