Japan's Takaaki Kajita and Canada's Arthur B. McDonald won the 2015 Nobel Prize for Physics for their discovery that neutrinos have mass, the award-giving body said on October 6.
"The discovery has changed our understanding of the innermost workings of matter and can prove crucial to our view of the universe," the Royal Swedish Academy of Sciences said in a statement awarding the 8 million Swedish crown ($962,000) prize.
Physics is the second of this year's Nobels. The prizes were first awarded in 1901 to honour achievements in science, literature and peace in accordance with the will of dynamite inventor and business tycoon Alfred Nobel.