Heart of the Matter

Neutrinos’ shifty behavior might help explain why the universe has so much stuff in it

A golden age for the neutrino is dawning.

Near Daya Bay in China, detectors record the faint flashes produced when antineutrinos hit. Photo­multiplier tubes (shown) pick up the signal. Roy Kaltschmidt/Lawrence Berkeley National Lab
CHANGING FLAVORS | One of the surprising properties of neutrinos is their ability to switch identities, or oscillate, over time.