[LS]

It was within the last three years, that’s all I know. I don’t usually watch it unless they do historical questions (Archimedes “laser beam”), but was drawn to this particular test.

[Yo-Yo]

There was a very fine episode (#70) of MythBusters where they tried to find out if the aluminum dope on the skin of the Hindenburg was the cause of the disaster.

They had to kick up the formula, but were very surprised at how fast the fabric burned.

Then they built scale models filled with hydrogen and burned them up, too.

You sure that's not the episode you're remembering?