Hi Everyone,

The 2015 Nobel Prize in Physics was just announced. The winners are Takaaki Kajita and Arthur B. McDonald, leaders of two large experiments which established that neutrinos -- ghostly particles that stream through you and the Earth by the billions -- have mass.

Neutrinos, the second most plentiful type of particle in the universe (behind photons) have no electric charge and were once thought to be massless, which would mean they zip along at the speed of light. But these two experiments, in Japan and in Canada, showed that neutrinos actually have a small but nonzero mass, helping to substantially sharpen our understanding of both particle physics and astrophysics.

Congratulations to these physicists and their teams of researchers on this well-deserved recognition.