MIT physicists have proposed a way to make a super sci-fi-sounding device: a neutrino 'laser,' which could help us probe the mysteries of the Universe.

Neutrinos are the most abundant particles that have mass, but in a cruel irony, they're extremely elusive, earning them the term 'ghost particle'. Although there are trillions of them zipping through your body at any given moment, they interact with matter so rarely that they're almost impossible to study.