Helium-3 is a rare isotope of helium that contains two protons and one neutron. Unlike the more common helium-4, which has two neutrons, helium-3 is lighter and has unique properties. It is primarily produced through the decay of tritium, a radioactive isotope of hydrogen, and can also be found in small amounts in natural gas deposits and lunar soil. One of the most exciting potential uses of helium-3 is in nuclear fusion research. Scientists believe that it could be used as a clean and efficient fuel source for fusion reactors, offering a way to generate energy without the harmful byproducts associated with traditional fossil fuels.