Humans only use approximately 10% of their brain?

Hi all, Im new to these forums. I have a simple question that I need answered:I have heard it from science magazines, newspapers and various people that the average human only use approximately 10% of their brain.First of all,How do scientists accurately determine this? Active parts of a human brain during consciousness? How many people did they trial this on? Whats the other 90% or so doing?Second of all,How could a human that has evolved be using less than 100% of its brain unless humans have de-evolved some how? Unless the 'random evolution' somehow 'evolved too far' and now humans have ended up with all this wasted brain space? I dont understand.Thanks for reading, answers very appreciated!MikeEdited by Adminnemooseus, : Topic title changed from "Evolution with Intelligence?" to "Humans only use approximately 10% of their brain?"

Hi all,Thanks for the replies. That snopes.com article cleared it up for me.The 'sci mag' I believe was one made for young teenagers that I flicked through last year or the year before... I'll see if I can find a copy. Its a shame that this garbage is still being told to kids.