The message
from Richard Brooks contains
these words:

There was a great kids book in the local library that mentioned that
hydrogen peroxide mixed with manganese dioxide was what powered some
WWII torpedoes. There was also a small projectile launcher experiment
using the two same materials on the same page.

It's also believed to have polished off the Kursk.

--
Skipweasel
We have always been at war with Iran. [George Orwell - almost]