Can someone please explain, why the department of energy is dealing in genetic research? I thought they are mainly dealing in nuclear energy and nuclear weapon

Can someone please explain, why the department of energy is dealing in genetic research? I thought they are mainly dealing in nuclear energy and nuclear weapons. What is the overlap between things nuclear and genetic research? The USA doesn't have a biological weapons program since 1972, says wikipedia: https://en.wikipedia.org/wiki/United_States_biological_weapons_program https://en.wikipedia.org/wiki/United_States_biological_weapo...