Where can I find a super low-friction wheel with a ring around it and also a little generator? I am making one of those silly home-brew perpetual motion machines with magnets. [more inside]
posted by brenton on Dec 7, 2008 - 3 answers

ScienceFilter: Creationists, crystals, and thermodynamics. [more inside]
posted by XMLicious on Feb 6, 2008 - 19 answers

Is magnetism free energy? How exactly does it work? [more inside]
posted by evariste on Aug 25, 2006 - 16 answers