Two scientists have won the Nobel Prize in physics for groundbreaking work showing that neutrinos -- subatomic particles -- have mass, contrary to what had been thought.
The prize was awarded to Takaaki Kajita and Arthur B. McDonald, the Nobel committee said, "for the discovery of neutrino oscillations, which shows that neutrinos have mass."
Kajita works at the University of Tokyo, in Kashiwa, Japan. McDonald works at Queen's University, in Kingston, Canada.
Last year's winners were two scientists in Japan and one at the University of California at Santa Barbara for helping create the LED light, a transformational and ubiquitous source that now lights up everything from our living rooms to our flashlights to our smart phones.