... on their way to the other side of the universe! A trillion particles, which are so small they can pass through a nucleus without even changing direction! In fact, they can travel through the earth, and the stars virtually unchanged! What exactly is a neutrino then? It's a tiny particle with about 0.0004 times the mass of an electron. There are three kinds of neutrino. - The electron neutrino is produced as part of Beta plus decay - The muon neutrino is created when a pion (a particle created when you fire protons at the nucleus - it exists for about a trillionth of a second) decays into a muon, which also only exists for a millionth of a second, before it turns into a muon neutrino! - The Tau electron is just like the muon electron but is created by tau particles instead of muons. Well, why are they interesting. Aren't they just boring sub ...

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