We’re turning 50 on June 15. Between now and then, we’re sharing 50 Fermilab discoveries and innovations! Today is our first milestone: when Fermilab's DONUT experiment discovered the tau neutrino.

On July 21, 2000, Fermilab announced the first direct evidence for a particle called the tau neutrino, the third kind of neutrino known to physicists. It had been hypothesized but never directly observed until the 2000 discovery, which was made by the DONUT (Direct Observation of the Nu Tau) experiment at Fermilab. The other two types, the electron neutrino and the muon neutrino, had been discovered in 1956 and 1962, respectively.

See all 50 milestones as they are released at the link in our profile - and let us know your favorite Fermilab discoveries and innovations!

#TBT #ThrowbackThursday #neutrinos #physics #science #lablife

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