More surprisingly, this human favor for water makes evolutionary(进化的)sense. Sure, we need drinking water to live, but we have also benefited from what's swimming under the waves.

　　Neuroscientist Crawford of the University of North London has proposed that our ancient ancestors attached to the sea, and that their devotion paid off by allowing the human species to develop large and complex brains.

　　Crawford claims that when humans separated from apes(类人猿)and appeared in the forests of Africa, they stuck close to rivers and beaches and started catching fish, clams and crabs. That seafood was packed with omega­3 fatty acids, essential fatty acids that promote brain cell growth.

　　It's no coincidence, Crawford claims, that human brain growth began to increase rapidly once we left the woods and headed for the beach.

　　Scientists have also discovered that people who eat fish regularly are less likely to suffer from depression than those who eat less seafood. Biochemist Hibbelin of the National Institutes of Health has shown that across cultures there is a direct link between amount of fish eaten each week and rates of depression. More interestingly, Hibbelin and researcher Laura have found that fish is commonly used as a symbol of happiness and good health in various religions and cultures.

　　We know that fish and the sea are good for us, and so we seek them out. We vacation on the coast and see the waves come and go, feeling happiness has taken over our brain. When we move inland, or go home from vacation, we lose touch with our sea roots and feel unhappy.

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