Mona doesn't like to ask people for help. But it is hard for her to perform daily activities on her own. She is almost 13, yet she is no larger than a 5-year-old. Mona has trouble keeping her balance and can't walk very far. When she uses a wheelchair, she can't push it herself.

    Fortunately, Mona has a wonderful service dog named Sam. A service dog is a dog that has been trained to assist someone who has a physical problem. Sam lets Mona lean on him when she walks. He also pulls her wheelchair and turns lights on and off. When Mona drops something, Sam picks it up. He even pulls her socks off at night.

    Sam also helps Mona with everyday tasks at school. He carries her books from class to class in a special backpack. He puts Mona's completed assignments in her teachers' homework trays. In the lunchroom he throws away her trash.

    Besides making Mona less dependent on other people, Sam helps her lead a fuller life. Mona's classmates flock around Sam like geese. This has helped her make friends. Sam also helps Mona be more active. With his aid, she raised over $500 in walk-a-thon for her local humane society.

    Because of Sam, Mona doesn't have to ask people for help. Sam brings her closer to other kids. And he even helps her contribute to her community.

    For his eleventh birthday, Lin was given a gift that would shape his life. On that day his father took him to the Children's Activity Centre and said he could choose any course that interested him. There was just one

Requirement: Lin would have to promise to study it for at least one year.

    To that point Lin had had many hobbies, but none kept his interest for more than a week or two. His mum once gave him a bag of stamps to encourage stamp collecting. That hobby lasted a week. Then his father got him some paints hoping that Lin's artistic side would shine through. Those paints were now under his bed, still unopened. This time Lin's parents would let him decide.

    Lin's eyes moved down the noticeboard that listed all the courses on offer. He stopped at "Photography". He liked the idea of taking beautiful pictures but the notice said that each student needed their own camera. Although Lin's family weren't poor, they weren't rich either, and a camera cost a lot of money. He continued looking.

    The next course to catch his eye was "Language Art". He didn't even know what that meant. His father explained that it taught people how to make public speeches. Lin, a shy boy, could think of nothing worse.

    Then he saw it. "Cooking" sounded like something he'd like to do. It was inexpensive and convenient. It could be done alone and it was also creative.

    Based on Lin's hobby history, his dad had doubts, but he agreed. Much to his parents' surprise, Lin kept his promise. He studied cooking at the Centre every Saturday, and practised at home, making delicious meals for his family. Everyone looked forward to birthdays, when they could eat his cakes. Lin got great satisfaction from the pleasure his food brought to others.

    The months turned to years but his hobby never changed again.

    Now Lin is an adult and runs a successful restaurant. When customers say they enjoy his meal, he still gets the same pleasure he did as a child, and remembers the special gift he received "all those years ago.

    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 finished bottom of his class. However , 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 (坚持不懈) can lead.

    At the age of 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, 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(克隆) of the adult frog. This technique later helped to create Dolly the sheep 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 the 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. "

    Hello, boys and girls. I'm Tom. Nice to meet you. Tom is my first name, What's my last name? My last name is Hanks. Tom Hanks is my full name(全名). I'm twelve years old. I'm from England and I'm English. Thanks.