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What are the chances that one is made up too? 
You know it's a common myth that humans don't use 100% of their brain? We use all of our brain. Interesting.
-oddguy  |
The reason for that is because people think of the brain as just one big thought computer. They don't realise that the grey fudge in their head is actually more complex than they think. The majority of the brain is actually more to do with decoding and processing various information from sensory organs. Also things like heartbeat, nerves, muscles, and sensations are controlled from the brain.
There are no estimations for how much of the brain gets used at once. Rather than using as much processing power as it needs, the brain uses all its processing power at once to complete a "task" as quickly as possible. This is why more capable brains can work better and faster.