US researchers have found that a number of commonly held medical beliefs are untrue or unproven. Among the beliefs they dispelled: 'Drink at least eight glasses of water a day''We use only 10% of our brains' 'Hair and fingernails continue to grow after death'
Read more at BBC News(1).

1. http://news.bbc.co.uk/2/hi/health/7153880.stm