First, we don't "only use 10% of our brain." This has been covered quite a bit in these forums. We may only have 10% - 20% or our neurons firing at any given time, but the ENTIRE brain gets used extensively, every day.
Second, what's this "undeniable proof" you write of? I know of no psychics who were able to prove their abilities under laboratory conditions, or even under verifiable circumstances. Please post a link to some of this evidence, because I've never heard of it and I'm always looking to learn something new.
In exchange, I will again post the link to the
James Randi One Million Dollar Paranormal Challenge. I invite you to find one of these "proven" psychics and ask them to split the money with you... Of course, I'd like a small cut for turning you on to this free money.