We used to take cases apart and collect a bunch of powder, to light.
Then we tried this with model rocket engines.
WOW!
we did the model rocket thing. Crushed a few of them up and sparked it off. One kid got too close and lost his eyebrows and threw his hairline back a few inches. Wonder if it ever grew back?
Then we tried this with model rocket engines.
WOW!
...and?