Neutrinos are teeny, tiny, nearly massless particles that travel at near lightspeeds. Born from violent astrophysical events like exploding stars and gamma ray bursts, they are fantastically abundant in the universe, and can move as easily through lead as we move through air. But they are notoriously difficult to pin down. "Neutrinos are really pretty strange particles when you get down to it," says John Conway, a professor of physics at University of California, Davis.
