Unfortunately the Yahoo link has expired, but what appears to be the same article is still available
here.
IIRC the "we use only 10 percent of our brains" myth comes from an early brain-mapping attempt in the 1930s; the experimenters electrically stimulated volunteers' brains and noted what happened (e.g. involuntary twitches) and asked the volunteers to report any unexpected events such as sounds or smells. In 90% of cases they couldn't see any result, and concluded "therefore only 10% of the brain is functional". What they
should have concluded is "therefore only 10% of the brain has functionality which can be detected by the present technique" because they overlooked things such as abstract thought. The "non-functional" 90% of the brain has had its functionality revealed by more sophisticated (and less invasive) techniques.
Quote:
Originally Posted by Terrie
I could comment on more but the water one has always
been my favourite.
[...]
Dehydration:
[...]
Exercise. [...], preteens and teens who participate in sports are especially susceptible, because of their smaller body weight.
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Another reason children are more prone to dehydration through sweating is the square-cube law; kids have a much higher surface-area:body-mass ratio than adults.