<human>:  Where was Helium-3 discovered?
<bot>: Helium-3 was discovered in the 1960s by a team of scientists at the University of California, Berkeley. The team was led by Glenn T. Seaborg, who was a Nobel Prize winner for his work on the discovery of plutonium. The team was looking for a new element to add to the periodic table, and they found it in the mineral pitchblende.