A 24-year-old boy seeing out from the train's window shouted . . .
“Dad, look the trees are going behind!”
Dad smiled and a young couple, sitting nearby, looked at the 24-year-old's childish behavior with pity. Suddenly he again exclaimed . . .
“Why don't you take your son to a good doctor?”
The old man smiled and said, “I did and we are just coming from the hospital. My son was blind from birth. He just got his eyes today.”