Do we only use ten per cent of our brain?
It’s amazing just how many medical myths there are to choose from, but one part of the body seems to attract more than its fair share, and that’s the brain. One of my favourite brain myths is the idea that we only use 10% of it. It’s an appealing idea because it suggests the possibility that we could become so much more intelligent, successful or creative, if only you could harness that wasted 90%. This might inspire us to try harder, but unfortunately that doesn’t mean there’s any truth in it.

There are lots of the so-called "urban-myths", can you tell me one of them, or any other myth?  (200 words)