[ColdWater]

A nuclear bomb does not leave unconverted fuel behind; whether fission, or fusion, the reaction always completes.

A nuclear bomb DOES leave incoverted fuel behind.

[editor-surveyor]

"A nuclear bomb DOES leave incoverted fuel behind."

Perhaps some microscopic amount, but from a statistical standpoint, it is the most efficient reaction we can generate, and is closer to 100% than 99.9%