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.
Additionally, drinking a sufficient amount of water can help. Make sure you drink at least 8 glasses or 2 liters of water a day. However, stay away from carbonated drinks such as sodas, colas, and beers as they tend to increase blood pressure instead of decrease it.