nuclear fusion converts hydrogen into helium
nuclear_fusion is nuclear_process. hydrogen_bomb is fusion_weapon. fusion is not nuclear_reaction. one_byproduct_of_hydrogen_fusion is not helium. one_byproduct_of_hydrogen_fusion is helium. fusion_rocket is nuclear_rocket. fusion is nuclear_reaction. nuclear_fusion is not nuclear_process. nuclear_fusion is not transformation_process. nuclear_fusion is transformation_process.