1.   In fusion reactions, light atoms are brought together sufficiently energetically to overcome their natural repulsion.

2.   Stars and hydrogen bombs fuse hydrogen, a light atom, into helium.

3.   The high temperatures needed to fuse light atoms erode the inside of fusion reactors.

4.   Fusion occurs when very light atoms, usually hydrogen, fuse together after colliding at very high temperatures and pressure.

5.   That fission explosion in turn compresses a second component, of light atoms, which fuse and give off heat in an even greater fusion explosion.