I've seen studies where applying a DC voltage to your brain significantly increases its performance with no (known) side-effects. Here's the first link I found,

I've seen studies where applying a DC voltage to your brain significantly increases its performance with no (known) side-effects. Here's the first link I found, if you're curious: http://gizmodo.com/5882754/how-to-electrify-your-brain-to-be-smarter-with-a-9+volt-battery http://gizmodo.com/5882754/how-to-electrify-your-brain-to-be...