Once there was a scientist. He lived in a small town alone, he felt very lonely.

One day,he slept at home. Suddenly, he heard someone shouting "Help!Help!"He ran outside at once. He saw a 8-year-old boy in the river and a dog sat on the ground. The boy told the scientist, "The dog wants to eat me". The scientist rushed to the dog, the dog was very afraid and ran away quickly. Then the scientist jumped into the river. He helped the boy out of danger. The boy said thank you to the scientist.