Do you believe that things are connected for no scientific reason at all? For example, do you avoid saying the word "four" to avoid bad luck? If so, you have a superstition (迷信). And you're not alone – all kinds of people have them.

For example, Portugal's soccer superstar Cristiano Ronaldo always steps onto the pitch (球场) with his right foot first, according to The Telegraph. And sports players are not alone in having superstitions. A visitor once asked the Nobel Prize winning scientist Niels Bohr whether he really believed that the horseshoe he'd hung at his country home was lucky. "Of course not," the Danish physicist said. "But I understand it's lucky whether you believe in it or not."

One recent study found that even scientists at MIT and other top US schools tended to look for a meaning in natural events, similar to the connection between stepping on the pitch and playing soccer well, according to The Atlantic. When the researchers gave the scientists little time to answer questions, they were twice as likely to agree with statements such as "Trees produce oxygen so that animals can breathe" as they were when they had more time to think about their reply.

It seems that fear can make people think differently in this way, too. In a British study, students imagined meeting a "witch" who said she would cast (施魔法) an evil spell(符咒) on them. About half said a scientist should not be worried about the spell. Yet each of them said that, personally, they wouldn't let the witch do it to them.

So why are so many of us superstitious? Well, it seems to be our way of dealing with the unknown. "Many people quite simply just want to believe," Brian Crank, a professor of psychology at Missouri Western State University, said in a 2008 interview. "The human brain is always trying to work out why things happen, and when the reason is not clear, we tend to make up some pretty bizarre (古怪的) explanations."

    And these explanations aren't completely unhelpful. In fact, superstitions can sometimes work and bring real luck, according to psychologists at the University of Cologne in Germany in the May 2010 issue of the journal Psychological Science. They found that believing in something can improve performance on a task like an exam.

    So, what about you? What superstitions do you follow to keep you safe and successful?

Reasons to visit St.Louis

Whether you're traveling alone, with a friend or with the whole family, there's a nearly endless selection of activities you'll want to experience—so many that it's hard to decide where to go first.

Missouri Botanical Garden

    You could easily spend an entire day making your way through the 79 acres(英亩)on display here. The gardens also boast(以拥有……而自豪) seasonal exhibits, such as the summer Lantern Festival—taking place through July—that showcases beautiful works of light each year.

4344 Shaw Blvd, 314-577-5100, missouribotanicalgarden. org.

St. Louis Art Museum Free

    There are more than 33,000 works on display here, including the recent addition of 225 donated pieces of feature work by American artists and more than 200 pieces from Asia. The museum is free, and special exhibits are free on Fridays.

    I Fine Arts Drive, 314-721-0072, slam. Org
St. Louis Science Center Free

    With a wealth of displays to keep kids and adults alike entertained and learning all day, the center boasts an impressive 700 hands-on exhibits, including a fossil dig site, water tables in the discovery room, electrical energy demonstrations, and cyber activities.

    5050 Oakland Ave, 314-289-4400, slsc.org

St. Louis Zoo Free (Free for some attractions)

    The zoo includes beautiful naturalistic displays and boasts plenty of activities to keep kids excited, from feeding exhibitions and safaris(游猎), to sea lion shows and conservation talks.

    One Government Drive, 314-781-0900, stlzoo.org.

    Whenever we see a button, we are eager to press it because we know something will happen. This is true in most cases, for example on a doorbell and on the "on/off" button on the TV. But some buttons are actually fake, like the "close" button on a lift.

    Many people are in the habit of pressing the "close" button because they don't have the patience to wait for the lift doors to shut. But lifts' "close" buttons are a complete scam (骗局), at least in the US-the doors will not close any faster no matter how hard you press.

    It started in the 1990s when the Americans with Disabilities Act was passed in the US, making sure that all lifts stayed open long enough so that people with disabilities could enter. Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.

    But to normal lift riders, the buttons aren't completely useless. According to psychologists, fake buttons can actually make you feel better by offering you a sense of control.

    "Perceived (能够感知的) control is very important. It reduces stress and increases well-being," Ellen J. Langer, a psychology professor, said, "having a lack of control is associated with depression（沮丧）."

    Experts have revealed that a lot of buttons that don't do anything exist in our lives for this same purpose. For example, many offices in the US have fake thermostats (温度调节器) because people tend to feel better when they think they can control the temperature in their workplace.

    Pedestrian(行人) crosswalk buttons don't live up to their names either. Pressing them used to help make the traffic signals change faster, but that was before computer-controlled traffic signals were introduced.

    But psychologists found it interesting that even when people are aware of these little "white lies", they still continue to push fake buttons because as long as the doors eventually close, it is considered to be worth the effort.

    "That habit is here to stay," John Kounios, a psychology professor, said. "Even though I have real doubts about the traffic light buttons, I always press them. After all, I've got nothing else to do while waiting. So why not press the button in the hope that this one will work?"

    All over the world people enjoy sports. Sports help to keep people healthy, happy and help them to live longer.

    Sports change with the season. People play different games in winter and summer.

    Games and sports often grow out of people's work and everyday activities. The Arabs use horses or camels in much of their everyday life; they use them in their sports, too.

    Some sports are so interesting that people everywhere go in for them. Football, for example, has spread around the world. Swimming is popular in all countries near the sea or in those with many rivers.

    Some sports or games go back to thousands of years, like running or jumping. Chinese boxing, for example, has a very long history. But basketball and volleyball are rather new. Neither one is a hundred years old yet. People are inventing new sports or games all the time.

    People from different countries may not be able to understand each other, but after a game they often become good friends. Sports help to train a person's character(性格). One learns to fight hard but fight fair, to win without pride and to lose with grace(体面).

    Galaxy saw a man and a woman who communicated with the sign language at the train station when she was on the way home one evening. She noticed that the woman asked the man for the direction. He told her that he did not know. Galaxy decided to help them. She had learned the sign language when she served as a volunteer in the deaf and mute (聋哑) school. Then she showed the woman the direction and left her email address to them in case they needed her help later.

    She received an email from that man the next day. Kazrim was his name. Galaxy replied to his mail sincerely. They both started chatting online soon after and began seeing each other. Although they only communicated with the sign language, it never bothered her.

    Galaxy was fond of him gradually. Obviously, Kazrim was the same too. He presented Galaxy with a bunch of sunflowers and asked her sincerely, "Are you willing to be my girlfriend?" Galaxy was pleasantly surprised. She requested him to give her some time to persuade her parents.

    As she had expected, her parents were very angry after they had learned of their love story. Galaxy explained, "Kazrim is an excellent and a very optimistic person. He has a very positive attitude towards life and work. He cares for others always. He is 100% better than the normal. Moreover, the mute is still a human. He should have a perfect and wonderful love."

    Her parents asked to see him, then. The very worried Galaxy took Kazrim home a few days later. When they were on the train, Kazrim told her, "I'm going to tell your parents I'll be looking after you well with all my life!" Galaxy was deeply moved.

As soon as they had entered the house, Galaxy introduced him to her parents. She said, "This is Kazrim." Just right after her speech, an unbelievable thing happened. Kazrim threw the gift away and held her in his arms tightly.

    He said, "YOU CAN TALK?" It was the same question that Galaxy wanted to ask, too.

    The four people were shocked all of a sudden. As a matter of fact, Kazrim always believed that Galaxy was a mute and he still fell in love with her deeply.

    Only about 30 percent of people in the US know how to perform CPR (心肺复苏术). Recently, a 9-year-old boy showed a Georgia woman how to perform CPR on her newborn baby.

    Susanna Rohm said she had experienced a parent's worst nightmare (噩梦) — her 2-month-old son, Isiah, was not breathing. "I noticed he looked pale. I looked at his arms and his legs and they were limp (无力的)," Rohm told a local newspaper. "Then I noticed that he looked like he wasn't alive." Indismay, she dropped and broke her cellphone. Rohm had to run into the street, screaming for help.

    "I had him in my arms and screamed over and over. Then I ran outside. I saw two boys playing across the street, and I yelled, 'Go and ask your parents to call 911,'" Rohm said. But the two boys were able to do more than that. Nine-year-old Ethan Wilson took action, showing Rohm how to perform CPR on little Isiah while ten-year-old Rocky Hurt helped as well.

    Rocky said he had learned the CPR technique from a poster in a health class at their school, Sedalia Park Elementary. "I was thinking we'd better give her a helping hand instead of getting scared," Ethan said. "I told her to push on the baby's chest five to ten times a minute with only two fingers, tilt back the baby's head, plug the baby's nose and breathe into the baby's mouth," Ethan said in an interview.

    At last, Isiah began crying and was breathing again. He spent two nights in a local hospital. "If the little boy hadn't shown me what to do right there, my baby would probably not be alive right now," Rohm said.