Mutations may occur in a normal cell as a result of cell division and the effects of environmental and lifestyle factors, such as smoking o r sunlight. Once the first cancer-causing, or driver, mutations occur, defects in cellular processes âfor example, in DNA repairâmay cause more mutations to occur.
U.S. men's national soccer team coach Jurgen Klinsmann out. U.S. men's national team coach Jurgen Klinsmann has been under increased pressure.
Coach K done coaching USA basketball after 2016 (2:01) Mike Krzyzewski tells Andy Katz that the 2016 Olympics will be his last coaching the United States men's basketball national team. (2:01)