Pat McGee noticed her daughter hadn't returned to the dentist's waiting room just before her surgery (外科手术). She walked to the bathroom and found Jessica McDaniels, 32, in there, crying.

    McGee took her daughter into her arms, "We're going to say 'goodbye' to the old Jessica," she said. "And 'hi' to the new Jessica."

    McDaniels, from St. Louis, US, had been wishing for this day since high school, when the bullying (霸凌) about her teeth started. Now that it was finally happening, she was worried and afraid.

    It was a social media post two months ago that got her there. Someone posted a photo of McDaniels with a comment about her overbite (龅牙). The post was shared many times, with many people making unkind comments on her appearance.

    The bullies didn't know the road McDaniels had traveled. She had nine operations on her ears from age 2 to 12 years old. She was almost deaf in her right ear. Her adult teeth didn't start coming in until she was 11 or 12, and doctors couldn't figure out why they were pushed outward. It got worse as she got older. McDaniels had been trying for years to get her teeth fixed, but it was always too costly.

    When her story got out, dentists wanted to help her. One of them, Maryann Udy, got in contact with McDaniels and offered her a new smile - free of charge. McDaniels wasn't sure at first, so she called her mother. The mother told her that Udy was her angel. "You need to do it," she told her daughter.

    The surgery was long and complicated (复杂的). It took weeks for the swelling (肿块) to go down, and several more months before McDaniels' new smile was ready. Later that year, she looked at her old photos online and smiled. "I loved her," she said. "She's thankful to be in less pain, to be on the way to a new smile. Sometimes, though, it feels like something is missing from who she was." Still, she loves taking selfies and admiring her new appearance. "I looked good before," she said. "I look even better now."

    Once upon a time, the colors in the world started to argue. All thought they were the most important and useful.

    Green said, "I'm the symbol of life and hope. I was chosen for grass, trees and leaves. Look around and you will see me everywhere."

    Blue followed, "You only consider the earth, but look at the sky and the sea."

    Yellow smiled, "I bring hope and warmth into the world. Look at the color of the sun and the moon."

    Orange continued, "I'm the color of joy. My beauty is so fantastic that no one can think of you at sunrise or sunset."

    Red shouted out, "I'm the ruler of you. I'm the color of life and live. So nobody can take my place." Purple stood up, "I'm the color of power. People never question me! They just listen and follow."

    Finally, indigo(靛青色) spoke slowly. "I stand for thought and reflection(反省).Yet all of you just need them."

    Suddenly, the sky became dark and rain started to pour down. The colors all gathered(聚集) in fear. Rain began to speak, "Join hands and come to me."

    The colors did as they were told. Rain added, "Don't you know you each are made for a certain purpose? When it rains, appear together to show that you can all live in peace. The rainbow(彩虹) is the color of your friendship."

    The car was invented just a century ago. You may know all kinds of cars' names, but many people don't know who was the inventor of the first car.

    The first car was invented not by an Englishman, but by an American. His name was Henry Ford.

    Henry was born in a poor family. He was the eldest of the six children. When he was a boy, he became interested in watches and machines. When he was twelve years old, his mother died. Soon he had to work in a machine shop for two dollars and fifty cents a week.

    In the evening, he repaired watches for another dollar a week. The hard life made him strong and able.

    At that time, there was another interest in the life of the young Ford. He wished of making a machine.

    It could run without horses, so named horseless carriage. He overcame a lot of difficulties and in April 1893, the "horseless carriage "was invented at last. It was the first car.

    Later Henry Ford founded the Ford Motor Company. He was really the first inventor of the car in the world.

    In 1901, Karl Landsteiner, an Austrian scientist, discovered that there are four types of blood. These four blood types were named A, B, AB and O. People have one of these four types. Blood type O is the most common around the world. Blood type A is the second most common, and type AB is the least common. If people with type A blood are given type B blood, or people with type B blood are given type A blood, they will probably die.

    In 1927, a Japanese doctor, Furukawa Takeji, carried out research and came up with the idea that people with different blood types also had different personalities(性格). He said that people with type A blood are usually calm and serious; people with type B blood are curious, cheerful and outgoing; people with type O blood are generous and trustworthy; while those with type AB blood are often caring, original and careful.

    More recently, a doctor in the United States wrote a book that links blood types and what people eat. For example, his book suggests people with type O blood should eat more meat and less bread. A diet for people with type A blood includes more vegetables. His book, Eat Right for Your Type, has been a hit with people who want to lose weight. However, Dr. Peter D' Adamo believes that eating food that matches a person's blood type can help them lose weight. He thinks it will make the person healthier in other ways, too.