Arduino hack that should have you just saying yes. New Zealand artist Rich Decibels created a homebrew brain entrainment device that uses low frequency sound and light to induce different mental states. The mod pieces together an Arduino Uno with two separate interface boards -- one for pitch and separation controls, the other for LED and volume -- to deliver a combo of binaural beats (two slightly out of sync tones) and flashing headset-mounted lights that'll slow down those cerebral hertz cycles. If you happen to live in the land made famous by Frodo's Shire, you can check out the brain-slowing goods at Thistle Hall's Project Briefcase exhibition. Not a Kiwi? Then be sure to hit the source for an audio taste of this hacked head experience.