CIRCLE WITH A DOT

Have I ever mentioned how much I love small physics demonstrators?
We had a chunky, thrown together version of this yesterday, but then it exploded when we filled it with gasoline and oxygen.
Some days ago I happened upon a good amount of acrylic, so I just had to build a smaller version of it!
Takes quite a whack, but then it ignites pretty much everything you throw in there

@JCBlubaugh @tinyledmatrix yeah it turned out all right

When you ask a friend to print some feet for your breadboard.

Thanks to @tinyledmatrix , I guess