[tgusa]

Stuff happens. When I was about 13, my dad was refinishing some floors and gave me a large bag of sawdust and told me to ‘go out back and burn it.’ Put it in the 55 gallon drum we used for burning. Mixed in some newspapers, lit the newspapers. Nothing. Mixed in some MORE newspapers - just smoldered. Figuring that pouring on gasoline would be a bad thing, I went to the garage, got some more newspapers and a shovel. Mixed it all up, lit the newspapers. As expected, more smoldering, so I stirred up the sawdust with the shovel.

I was told later that the resultant mushroom cloud was most impressive.

[CrazyIvan]

Amazing what combustibles will do if in small enough
particles and the right stochiometric ratio. I had a
grain mill dust explosion happen 20 miles from my place
once and thought it was a heavy charge at the quarry just
2 miles away.