OFWW writes:
Steel wool catches fire easily, just so as you are aware of it. I like
to bet that I can set steel on fire. Haven't lost yet.

Setting steel wool on fire is an old boy scout trick for starting camp
fires, since two D cells are sufficient, and flashlights often had D
cells in them.

Mythbusters did a test with coffee creamer and a flare. The creamer
wouldn't catch fire until it was blown (as in with wind) into the air.
When it got to the right mix it nearly exploded. Wood flour (and even
wheat flour) is the same thing; as a pile on the ground it's safe but as
a cloud in the air it's highly flammable.