One day, a poor boy who was selling things from door to door found that he only has a cent(美分) left. He was so hungry that he decided to ask for a meal at the nex t house.

     However, he just asked for a glass of water when a beautiful young woman opened the door. She though he looked hungry, so she brought him a lager glass milk. He drank in slowly, and then asked, “How much do I owe (欠) you”

“You don't owe me anything.” she replied, “Mother has taught me never to accept pay for a kindness.”

     Years later the women needed an operation(手术). The local doctors could do nothing. The finally sent her to a big city. Dr. Milton, who was famous, was called in for the consultation (会诊). When he heard the name of the town she cam form, he went to see her. He recognized  (认出) her at one. At the same time, he made his decision to try his best to save her life.

After hard work, the operation was successful. Dr. Milton asked the nurse to pass the final bill to him. He wrote something on the side. The bill was sent to the patient's room. She was afraid to open it because she thought it would cost all her money. To her surprise, she saw there words written by Dr. Milton: “Paid in full with a glass of milk.”

     Tears ran out of her eyes as she said silently, “Thank you. Love has spread through human hears and hands.”

    Clark and Dale were staying in the same room in hospital. Clark was so sick that he could not even move his body. He had to spend all his time lying on his back. Dale could sit up in his bed for an hour each afternoon. His bed was next to the room's only window.

    Over time, Clark and Dale became good friends. Every afternoon, Dale would look out of the room's only window, describing the scenery outside for his friend. He told Clark about the flowers in a park outside the window, the people walking by, the green trees beside the roads—anything that might interest a man.

    On morning, when a nurse came only to check the two men, she found that Dale had died in his sleep. As soon as the room seemed tidy again. Clark asked if he could move to the bed next to the window so that he could look out of the window himself. The nurse agreed. Slowly, he could take his first look at the world outside. To his surprise, he could see nothing but a blank wall of another building.

    The nurse explained that Dale had been blind. He had never seen anything outside the window at all—but he described beautiful scenes to help his friend better.

    One evening Mr Black was driving his car around the country. He wanted to find a small hotel. Then he saw an old man at the side of the road. He stopped his car and said to the old man, "I want to go to the Sun Hotel. Do you know it?" "Yes, "the old man answered. "I'll show you the way."

    He got into Mr Black's car, and they drove about 12 miles. When they came to a small house, the old man said, "Stop here."

    Mr Black stopped and looked at the house. "But this isn't the hotel, "he said to the old man.

    "No," the old man answered. "This is my house. And I'll show you the way to the Sun Hotel. Turn around and go back nine miles. Then you'll see the Sun Hotel on the left."

    Life is full of surprises and you never know how things will turn out.

    Sir John Gurdon is a good example of this. As a boy, he was told he was hopeless at science and was at bottom of his class. Now, aged 79, the very same Gurdon shared the 2012 Nobel Prize in Medicine with Japanese stem cell (干细胞) researcher Shinya Yamanaka.

    Like so many scientists, Gurdon shows us where the power of curiosity and perseverance(坚持) can lead.

    When he was 15 in 1948, Gurdon ranked last out of the 250 boys at his high school in biology and every other science subject. Gurdon's high school science teacher even said that his dream of becoming a scientist was "quite ridiculous".

    In spite of his teacher's criticisms(批评), Gurdon followed his curiosity and kept working hard. He went to the lab early and left later than anyone else. He experienced thousands of failures.

    "My own belief is that we will, in the end, understand everything about how cells actually work," Gurdon said.

    In 1962, Gurdon took a cell from an adult frog and moved its genetic (基因的) information into an egg cell. The egg cell then grew into a clone of the adult frog. This technique later helped to create the sheep Dolly in 1996，the first cloned mammal(哺乳动物) in the world.

    In 2006, Gurdon's work was developed by Yamanaka to show that a sample(样本) of a person's skin can be used to create stem cells. Using this technique, doctors can repair a patient's heart after a heart attack.

    "Luck favors the prepared mind," Gurdon told the Nobel Prize Organization. "Ninety percent of the time things don't work, but when they do, you have to seize(抓住) the chance."