Don't you just love ice skating every winter?I am sure that since winter is approaching,your skates are set to come out,just waiting to be used.Impress your friends with your new trick on how to ice-skate backwards with the help of these tips.

Stand Straight

    The first thing that you need to do is,stand straight.If you feel that you are falling backwards,just put your chin up and slightly bend your knees.

Confidence is What You Need

    The most important step while learning how to skate backwards,is having enough confidence in what you are doing.How can you achieve this?By practice.Just practice rolling backwards down a gentle slope everyday or just by pushing off from a wall or something of that sort.But before you do that,make sure that the place where you are practicing is free from any kind of debris（碎片）because otherwise,you could land up in the hospital due to some accident.While going backwards,just get used to the feeling of moving backwards.One of the important ice skating tips and techniques is that if you feel that you are losing your balance,then scissor（做剪式运动）your skates.Keep practicing this till you are confident about it.

Maintain Speed

    Confident now?Great!Now the next step is to maintain your speed.While rolling in a straight line with one skate, with the other try sculling（划桨）,that is,keep pushing yourself backwards with an outwards stroke（滑动）.Make sure that you put most of your weight on the skate which is moving straight and not the one with which you are sculling.Now,try the same thing using the other foot.Again keep doing this till you are confident enough.

Increase Your Speed Now

    Once you are confident that you can scull with either foot,the next thing that you have to do is increase your speed.Try some of your own tricks now.Scull with either foot or with both at the same time. 

Scull and Be Aware

    While you keep one foot straight,keep sculling with the other.You can do that with both feet at the same time. Concentrate on what you are doing but don't get so absorbed,that you don't see where you are going.If you are not watching your back,you might bang（碰撞）against something or someone.

    I used to think education was the most important thing in my life. Recently my attitude has begun to change, although I still hold that it is essential for everyone in the world today. As a top junior student in my college, I was asked to make a speech on how to learn English well. Standing in front of the audience and facing so many freshmen, I was trembling. I didn't remember any word that I had prepared. I ran out of the conference room without finishing my speech, leaving everyone puzzled. I cried that night in my room, feeling that I was a loser. Studying takes up so much of my time that I feel unable to really develop myself. I am just storing knowledge, yet I fail to communicate with others. I have received many awards in school, but they don't necessarily reflect anything about me. I don't know how to socialize. When I leave school I fear I will be of no use to society.

    I realize that everyone has his own way of living. I want to change my lifestyle. Of course I will keep studying. Yet I plan to look for a part-time job, which might turn out to be a good chance to get to know society. I still believe that working my hardest makes me happy. I will still stay on in college. But I will not allow it to shelter me from the real world.

    The evidence for harmony may not be obvious in some families. But it seems that four out of five young people now get on with their parents, which is the opposite of the popularly held image of unhappy teenagers locked in their room after endless family quarrels.

    An important new study into teenage attitudes surprisingly shows that their family life is more harmonious than it has ever been in the past." We were surprised by just how positive today's young people seen to be about their families," said one member of the research team. "They're expected to be rebellious(叛逆的) and selfish but actually they have other things on their minds; they want a car and material goods, and they worry about whether school is serving them well. There's more negotiation and discussion between parents and children, and children expect to take part in the family decision-making process. They don't want to rock the boat."

    So it seems that this generation of parents is much more likely than parents of 30 years ago to treat their children as friends. "My parents are happy to discuss things with me and willing to listen to me," says 17-years-old Daniel Lazall. "I always tell them when I'm going out clubbing. As long as they know what I'm doing, they're fine with it." Susan Crome, who is now 21, agrees." Looking back on the last 10 years, there was a lot of what you could call negotiation. For example, as long as I'd done all my homework, I could go out on a Saturday night. But I think my grandparents were a lot stricter with my parents than that."

    Maybe this positive view of family life should not be unexpected. It is possible that the idea of teenagers' rebellion is not rooted in real facts. A researcher comments, "Our surprise that teenagers say they get along well with their parents comes because of a brief period in our social history when teenagers were regarded as different beings. But that idea of rebelling and breaking away from their parents really only happened during that one time in the 1960s when everyone rebelled. The normal situation throughout history has been a smooth change from helping out with the family business to taking it over."

    A new officer with the Huntington Park Police patrols (巡逻) local parks 24 hours a day seven days a week. He doesn't need rest, coffee breaks, a salary or medical insurance, and that is because it is a Robocop.

    The main function of the Robocop is to scan and film the surroundings. Besides cameras with night vision that report 360 degrees, it also has a distress button which is located here, so if somebody is to need assistance or they want to contact the communication center, they can do it by way of that distress button. There are people that are monitoring on the other end.

    This newest police employee is self-charging. It's easy to program it and make changes to the software if necessary. Its maintenance (维护) costs are roughly 75 thousand dollars a year. It travels the entire park. It is a programmed path, but the police are able to change the path and adapt it.

    The Robocop can record the license plates (车牌) of passing cars and check them against an online database of stolen cars. It can also help locate a lost iPhone because it is able to determine a smartphone's MAC address. The police can see from the robot if something wrong happens and then come and figure it out.

    The Robocop can't replace its human handlers. The whole goal is to give police more time to do things machines can't do. The police have been having some concerns about safety of the parks and want an extra set of eyes that will help patrol a 24/7.Robocop's creators believe this model known as K5 is best used for providing security at public places like hospitals, parking lots, parks and airports. So far, it seems to be working out just fine.

Ken was my best friend for 30 years. I told him I would leave Chicago for Philadelphia to receive a new job there. "What do you mean you're leaving?" Ken asked angrily. "When did you interview for a job in another city? You had never told me before." I explained that was the new company's rule. "Like you couldn't tell me?" he asked. "I thought our friendship meant more to you than that." "I'm sorry," I said. But I would never give up the job because of friends.

Ken and I had met in a church. Then Ken was a college student studying mental health and I was working in a company. I found we both grew up in small towns and struggled for school life. He often volunteered in Thailand during school holidays. And I once worked there for five years. Talking with Keri gave me great pleasure. Gradually, our conversations even involved in deeper subjects, like our dreams.

I was older than Ken. When he married Lee, I gave him advice about marriage. By that time, I was running a television production business, and was under a lot of stress. It was Ken who encouraged me and helped me get through the hard time. He was a great guy. Even so, I didn't change my mind.

Anyway, when leaving Chicago, Ken and Lee had a warm farewell (告别) party. But we didn't talk much later. After September 2012, everything changed. It started with a letter from Ken: Lee had cancer. Unfortunately, I got divorced (离婚) later and everything was a mess.

In February 2013,I flew to Chicago to see Ken and Lee. We talked. I found there was no one I had ever been able to talk to quite like Ken. I needed to be there for Ken in any way I could. This friendship mattered more than work. When going back to Philadelphia, I left my job and bought a plane ticket that would mean a lot to the rest of my life.

"Assume you are wrong." The advice came from Brian Nosek, a psychology professor, who was offering a strategy for pursuing better science.

To understand the context for Nosek's advice, we need to take a step back to the nature of science itself. You see despite what many of us learned in elementary school, there is no single scientific method. Just as scientific theories become elaborated and change, so do scientific methods.

But methodological reform hasn't come without some fretting and friction. Nasty things have been said by and about methodological reformers. Few people like having the value of their life's work called into question. On the other side, few people are good at voicing criticisms in kind and constructive ways. So, part of the challenge is figuring out how to bake critical self-reflection into the culture of science itself, so it unfolds as a welcome and integrated part of the process, and not an embarrassing sideshow.

What Nosek recommended was a strategy for changing the way we offer and respond to critique. Assuming you are right might be a motivating force, sustaining the enormous effort that conducting scientific work requires. But it also makes it easy to interpret criticisms as personal attacks. Beginning, instead, from the assumption you are wrong, a criticism is easier to interpret as a constructive suggestion for how to be less wrong—a goal that your critic presumably shares.

One worry about this approach is that it could be demoralizing for scientists. Striving to be less wrong might be a less effective motivation than the promise of being right. Another concern is that a strategy that works well within science could backfire when it comes to communicating science with the public. Without an appreciation for how science works, it's easy to take uncertainty or disagreements as marks against science, when in fact they reflect some of the very features of science that make it our best approach to reaching reliable conclusions about the world. Science is reliable because it responds to evidence: as the quantity and quality of our evidence improves, our theories can and should change, too.

Despite these worries, I like Nosek's suggestion because it builds in cognitive humility along with a sense that we can do better. It also builds in a sense of community—we're all in the same boat when it comes to falling short of getting things right.

Unfortunately, this still leaves us with an untested hypothesis （假说）: that assuming one is wrong can change community norms for the better, and ultimately support better science and even, perhaps, better decisions in life. I don't know if that's true. In fact, I should probably assume that it's wrong. But with the benefit of the scientific community and our best methodological tools, I hope we can get it less wrong, together.