What the heck is it? Zapping your brain with tiny jolts of electricity in order to increase the likelihood of neurons firing. You can use 2 (or more electrodes) to pass the power through your brain, and depending on where you put them you can experience different effects.
Some placements enhance learning (DARPA study), some enhance motor skills, and some treat depression.
It's all really interesting stuff, and I just got a kit to experiment with. Here's to exploring the brain!
Cheers,
Nik @ PT