Do we really use 10% of our brain?

Do we really use 10% of our brain?
The decades old myth that we only use a small fraction of our brain power has even crept into popular culture, but is it true?

BBC Reel's Howard Timberlake summons the mental strength to investigate.

What happens when you donate your brain?

Rory Cellan-Jones has Parkinson's Disease he's considering donating his brain after death
Patient at King's College Hospital played the violin while surgeons removed a brain tumour
Professional musician Dagmar Turner was diagnosed with a large brain tumour in 2013.