Might have been tuff for quite a few folks, but long ago, I helped a Museum restore a McLaughlin Buick- powered 1924 Firetruck, which got me interested in looking up the diff between a McLaughlin Buick and a Buick and that's when I found that the Canadian Buicks were all McLaughlin Buicks until 1942 and that he was ... (etc)
Anyway - in honor of of our "fallen comrade" (35Terraplane-who will be up and around again in no time - even if only to chase the nurses!) - this is the kind of Q he would pose:
In VERY early experimental internal combustion engines, many, many fuels were tried. Not all were gaseous or liquid. Even gunpowder was tried. What was another solid fuel that actually (sort of) worked ?