We've all heard about TMS -- transcranial magnetic stimulation. With TMS, doctors use a very strong magnetic field to instantly produce huge changes in the brain. It turns out the
inverse may also be true.
A very weak magnetic field, pulsing at the same frequency for period of time, may cause the brain to "sync" to the pulsing frequency. (http://www.elfis.net/elfol8/e8elfeeg2.htm)
That means there's a way to boost your mind without needing blinky-light goggles or loud pulsing tones in your ears... and all it takes is a ten-minute 555 project with a relay
coil (or any other electromagnet) and a potentiometer.