Zinc based audio oscillators
Courtesy of the Make blog, check out Nyle Steiner’s Electronic Composition, using a variety of audio circuits which use bits of heated zinc instead of transistors. Nyle has done a bunch of experimentation with zinc negative resistance oscillators on his Spark, Bang, Buzz website, all of which are awesome.
httpv://www.youtube.com/watch?v=Z44jlvpRHXc