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.
Behind the scenes in choosing U.S. hockey team. Team USA general manager David Poile had a difficult process in putting together the 25-man men's hockey squad that will represent the United States at the Sochi Olympics.