Can't concentrate? Scientists say you should drink some water

Ever have one of those days where you just can't focus on anything? If you're crawling through your work day and your brain just doesn't feel as sharp as it should, water might be the answer. That advice comes from a new research effort that looked at the results of 33 different studies related to mental acuity and dehydration, and there's some very solid evidence that the two are linked. It's already widely known that severe dehydration causes all kinds of terrible things to happen with the hum...