The strangest particle in the universe may be among the most important, according to new results. Our science correspondent David Whitehouse reports.
Neutrinos are probably the strangest particles in the universe.
They are commonplace in nuclear reactions, especially at the sun's core. Billions are harmlessly passing through you as you read this. They hardly interact with matter at all. A neutrino could pass through many million million miles of lead before it would be stopped. The neutrino was predicted long before it was discovered.