For those of us of a certain generation think back pretty fondly to Mr Wizard's World on Nickelodeon in the 1980's. Actually, quite a few generations think back fondly to Mr Wizard as Don Herbert started as Mr Wizard in 1951. He's even still being parodied on SNL.
This clip hits two things that we cover in matsci class at Princeton: thermal expansion (like the iron wire sagging) and the bimetallic strip.
In fact, the two wooden splints used to demonstrate the bimetallic strip at 2:00 is just about as brilliant a demonstration of that phenomenon as I've seen. Nicely done, Don.
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