Literally, in order for a vortex to be classified as a tornado, it must be in contact with the ground and the cloud base. Weather scientists haven't found it so simple in practice, however, to classify and define tornadoes (per this essay by Doswell).
Bikini Island, 2015. Credit: Emlyn Hughes. (Phys.org)âA team of researchers from Columbia University in New York has found that all of the Marshall Islands involved in nuclear tests by the U.S. are now habitable, except for Bikini Atoll.
RÃ©ard named his invention the bikini because of the Bikini Atoll nuclear tests. He thought that everyone would be shocked by the risquÃ© display of curves and belly buttons. He was right. During many years, the bikini caused more surprise than any of the nuclear tests conducted by the United States and the Soviet Union.