What did the scientist of the Manhattan project discover?

The scientists of the Manhattan Project, a World War II research initiative, discovered how to harness nuclear fission to create atomic bombs. Their work led to the development of two types of bombs: one using uranium-235 and the other using plutonium-239. The project culminated in the first successful test of a nuclear device, known as the Trinity Test, in July 1945, and subsequently the bombings of Hiroshima and Nagasaki in August 1945. Their discoveries fundamentally changed the nature of warfare and initiated the nuclear age.