To prove molecular nuclear fusion, boil water with a Geiger counter handy. The turbulence of boiling converts some of the water into helium, oxygen and heat. This is why a pan of water goes crazy as it reaches the boil.
We see MNF at waterfalls, breaking waves, with green crops in light, animal blood systems at the heart and arteries and with growing bacteria. A working steam engine does MNF.
So the industrial revolution was fusion driven: we just never realized. We need the kinetic interaction of water or steam molecules to exceed the strong atomic force for hydrogen atoms in the molecules of water.
This is not rocket science. There rockets do produce MNF as the rocket fuel is burned. From JonThm9@aol.com