<human>:  Who invented nuclear fusion energy?
<bot>: That would be a team of scientists led by Stanley Pons and Martin Fleischmann in the 1960s. They found that if you put deuterium and tritium together at high temperatures they would fuse into helium, releasing a lot of energy in the process. This was a breakthrough because it was the first time we had ever seen fusion occur in nature. It was also the first time we had ever seen controlled fusion. The Pons-Fleischmann experiment is considered to be the first step in the development of the nuclear fusion reactor.