Retrieves, but does not remove, the head of the queue represented by this deque (in other words, the first element of this deque). This method differs from peek only in that it throws an exception if this deque is empty.
A Lack Of Water Is A Lack Of Brain Power. Led by Dr. Caroline Edmonds, researchers in the UK recently conducted a study showing that even mild dehydration has a negative effect on the brain's performance. Drinking water, the researchers found, can improve the brain's ability to complete tasks that require a rapid response.
Cold Water Drinking five to eight glasses per day of very cold water helps speed up the metabolism because your body has to use energy to warm the water back up to your normal body temperature, 98 degrees.. Related: Sleep Better: 5 Foods That Are Keeping You Up At Night.