The "ten percent" claim only hangs around because it makes good hearsay evidence for psychic capability.

<a href="http://www.snopes.com/science/stats/10percnt.htm" target=_blank>It's</a> <a href="http://www.csicop.org/si/9903/ten-percent-myth.html" target=_blank>a</a> <a href="http://faculty.washington.edu/chudler/tenper.html" target=_blank>myth</a>.