User: Who discovered the muon?
Assistant: The muon was discovered in 1936 by Carl D. Anderson. It was named after the Greek word for heavy. The muon is a lepton, a type of particle that has no charge and no mass. The muon is one of the most common particles in the universe, and it is also the most massive. The muon is very similar to the electron, but it has a mass about 200 times larger than that of the electron. The muon decays into an electron and a neutrino in about 2.2 microseconds.