Keep in mind, this was not a small thermonuclear device, sometimes colloquially called a “hydrogen bomb.” No fissile material ...

Pyongyang said it had tested a hydrogen bomb - a device many times more powerful than an atomic bomb. Analysts say the claims should be treated with caution, but its nuclear capability is clearly ...

I described how some of the heavier elements will fission, releasing energy as they get smaller.  Modern physics also shows the lighter 26 elements release energy as they get larger ...