Do you like exercising in the sun? How much sunlight do you get every day? How much time do you spend in the1? As we all know，enough sunlight is good for our health. It gives us strong bones (骨骼) and good eyesight. It makes us happy and sleep better. Now scientists find out that it can even make you2.
Scientists did tests on mice. They give mice lots of sunlight. After that，the mice3a special thing named glutamic acid (谷氨酸) in their bodies. Glutamic acid does many things for our body. It can improve some of our abilities such as learning and remembering things.
It is OK to enjoy some sunlight for about an hour every day. But you should be4because it is summer now. The sun is very strong around noon. Keep yourself away from the sun around the noon, or it may5your skin (皮肤). It is best to enjoy sunlight in the morning or before sunset.
Why not go out and enjoy the6with your family or your best friends? I'm sure you can be smarter soon.
