a tesla coil, built from trash
how to turn everything punk into middle class twee.. with only a t-shirt!
take any old graphics card, add some clever software, and voila! up to 18 times faster code than running on a CPU
any boring old hyperbaric oxygen chamber (read: a tent, with lots of O2 in it) massively increases the number of circulating stem cells - which boosts body repair
and low tech from high tech? why, it's the US government, of course.. in 2 months.. when they run out of money (no, I'm not making this up)