My name is Clara. I still remember that chilly December day,sitting in science class. I'd finished a worksheet early and picked up a TIME for Kids magazine. A piece of news caught my eye: NASA was holding an essay contest to name its Mars rover(火星探测器). Before I even knew anything else about it,a single word flooded my 11-year-old mind, Curiosity.

    I couldn't want for the bell to ring so I could get started on my essay.That afternoon, I raced home, sat down at the computer, and typed until my fingers ached. “Curiosity is an everlasting flame that burns in everyone's mind...”

    Five months later, my mon received a phone call, and immediately, a wide smile spread across her face.

    On August 5,2012, at 10:31 p.m, the rover named Curiosity touched down safely on the surface of Mars,and I was honored to have a front-row seat in NASA.

    Curiosity is such an important part of who I am.I have always been fascinated by the stars,the planets,the sky and the universe. I remember as a little girl,my grandmother and I would sit together in the backyard for hours.She'd tell me stories and point out the stars,Grandma lived in China,thousands of miles away from my home in Kansas,but the stars kept us together even when we were apart.They were always there, yet there was so much I didn't know about them.That's what I love so much about space.

    People often ask me why we go to faraway places like Mares.My answer is simple because we're curious.We human beings do not just hole up in one place.We are constantly wondering and trying to find out what's over the hill and beyond the horizon.

    Mr. Glen is a millionaire. Five years ago, after returning from abroad to his motherland, he 1 his small company. Speaking of success, Glen often tells us a story about his extra expensive “school” fee. He always 2 his success to it.

    At that time, Glen, who already got a Ph.D. degree, 3 to return to the homeland, starting a company. Before leaving, he bought a Rolex watch with the 4 made through years of work after school and the scholarships. At the airport he had to accept the 5 customs check. The watch on his wrist was also demanded to be taken down for 6. Glen knew that carrying the specific goods out had to pay the tax, and he worried about paying 7 for his watch. So when he was checked, he told a lie that his watch was a 8 fake（假货）. When he was 9 of his “smarts”, immediately, in the presence of Glen, the officers hit the watch, 10cost nearly 100,000, into pieces 11 hearing Glen's words. Glen was 12 . Before he understood why, he was taken to the office to be examined 13 . For many times of entry-exit 14  he knew that only those people in the “blacklist” would “enjoy” this special treatment. The officers looked over everything carefully in the box, and 15 him no matter what time of entry and exit he must accept the check and if 16 reusing and carrying fakes, he would be 17 according to law! Suddenly, his face turned red, and he had nothing in mind after boarding the plane for long.

    After returning to the homeland, he often told the story to his family, and his employees, too. He said that this made a deep 18on him, because the additional high “school” fee that he had ever paid made him realize the value of 19, which he would remember as the 20 of his success forever.

    Here is an astonishing and significant fact: Mental work alone can't make us tire. It sounds absurd. But a years ago, scientists tried to find out how long the human brain could labor without reaching a stage of fatigue (疲劳). To the amazement of these scientists, they discovered that blood passing through the brain, when it is active, shows no fatigue at all! If we took a drop of blood from a day laborer, we would find it full of fatigue toxins(毒素) and fatigue products. But if we took blood from the brain of an Albert Einstein, it would show no fatigue toxins at the end of the day.

    So far as the brain is concerned, it can work as well and swiftly at the end of eight or even twelve hours of effort as at the beginning. The brain is totally tireless. So what makes us tired?

    Some scientists declare that most of our fatigue comes from our mental and emotional(情绪的) attitudes. One of England's most outstanding scientists, J.A. Hadfield, says, “The greater part of the fatigue from which we suffer is of mental origin. In fact, fatigue of purely physical origin is rare.” Dr. Brill, a famous American scientist, goes even further. He declares, “One hundred percent of the fatigue of sitting worker in good health is due to emotional problems.”

    What kinds of emotions make sitting workers tired? Joy? Satisfaction? No! A feeling of being bored, anger, anxiety, tenseness, worry, a feeling of not being appreciated---those are the emotions that tire sitting workers. Hard work by itself seldom causes fatigue. We get tired because our emotions produce nervousness in the body.