Tornadoes are nature's most violent storms, which can cause deaths and destroy a neighborhood in seconds. A tornado appears as a funnel-shaped (漏斗状) cloud from a thunderstorm to the ground with whirling (飞快移动) winds that can reach 300 miles per hour. Damage paths can be over one mile wide and 50 miles long. Every state is at some risk from this disaster.

    Some tornadoes can be seen clearly, while rain or nearby low-hanging clouds obscure others. At many times, tornadoes develop so rapidly that little, if any, advance warning is possible.

    Before a tornado hits, the air may become very still. A cloud of debris (散片) can mark the location of a tornado even if a funnel can not be seen. Tornadoes generally occur near the edge of a thunderstorm, when the strong wind may die down. It is not uncommon to see clear, sunlit skies behind a tornado.

The following are facts about tornadoes:

    The average forward speed of a tornado is 30 MPH, but may also vary from still to 70 MPH. Debris is picked up or a cloud forms in the funnel.

    The average tornado moves from southwest to northeast, but tornadoes have been known to move in any direction. Tornadoes are most often reported east of the Rocky Mountains during spring and summer months.

    Tornadoes can happen together with tropical storms and hurricanes as they move onto land. Waterspouts are tornadoes that form over water.

    The tornado season in the southern states of America is March through May; in the northern states, it is late spring through early summer. Tornadoes are most likely to occur between 3 p.m. and 9 p.m., but can occur at any time.

    When we do something, we all have our own plans. Some people are born planners. I can't claim (宣称) to be one of that kind of people. Most of the time, I try to at least expect what might go wrong. I have taken to making lists and, although I'm not yet achieving perfection, I usually manage to achieve goals. But there are times when even the best plans do not succeed. All that is left then is to smile and to make or do something using whatever is found.

Hanukkah (光明节) came early this year, perhaps too soon after Thanksgiving to allow us to prepare well. During the first night of Hanukkah, the Hanukkah candles were nowhere to be found in the entire Dallas area where we lived. Birthday candles wouldn't work! The tall long thin candle fell in small drops. "What would our ancestors do?" I thought. "What shall I do now? That's where ingenuity comes from. Don't be nervous and worried. Never let missing candles spoil a family celebration." Later what we did find was a bag of tea lights. The long, silver bread tray became the base for our tea lights. The younger ones were wide-eyed and happy as Grandpa lit the first tea light and all recited the blessing. We sat at the dining table, happy to be together and the food was plentiful.

    No matter how imperfect it is, the fact that families gather to share a special event, an event that has held meaning for so many generations of families, is the meaning itself and forms the important part of the observance (仪式). What we need to remember, and to carry with us, is the knowledge that togetherness is much better than all other concerns.

    Chinese scientists recently have produced two monkeys with the same gene, Zhong Zhong and Hua Hua, using the same technique that gave us Dolly the sheep. These monkeys are not actually the first primates（灵长类）to be cloned. Another one named Tetra was produced in the late 1990s by embryo（胚胎）splitting, the division of an early-stage embryo into two or four separate cells to make clones. By contrast, they were each made by replacing an egg cell nucleus（原子核）with DNA from a differentiated body cell. This Dolly method, known as somatic cell nuclear transfer（SCNT）, can create more clones and allows researchers greater control over the edits they make to the DNA.

    Success came from adopting several new techniques. These included a new type of microscopy to better view the cells during handling or using several materials that encourage cell reprogramming, which hadn't been tried before on primates. Still, the research process proved difficult, and many attempts by the team failed. Just two healthy baby monkeys born from more than 60 tested mothers. This leads to many researchers' pouring water on the idea that the team's results bring scientists closer to cloning humans. They thought this work is not a stepping stone to establishing methods for obtaining live born human clones. Instead, this clearly remains a very foolish thing to attempt, it would be far too inefficient, far too unsafe, and it is also pointless.

    But the scientists involved emphasize that this is not their goal. There is now no barrier for cloning primate species, thus cloning humans is closer to reality. However, their research purpose is entirely for producing non-human primate models for human diseases; they absolutely have no intention, and society will not permit this work to be extended to humans. Despite limitations, they treat this breakthrough a novel model system for scientists studying human biology and disease.

    As computers become all the more popular in China, Chinese people are increasingly relying on computer keyboards to input Chinese characters. But if they use the computer too much, they may end up forgetting the exact strokes （笔画）of each Chinese character when writing on paper. Experts suggest people, especially students, write by hand more.

    Do you write by hand more or type more? In Beijing, students start using a computer as early as primary school. And computer dependence is more wide-spread among university students. Almost all their writings are typed on a computer.

    All the students interviewed say they usually use a computer.

    It's faster and easier to correct if using a computer. And that's why computers are being used more and more often to modern education. But when people are taking stock in computers increasingly, problems appear. "When I'm writing with a pen, I find I often can't remember how to write a character, though I feel I'm familiar with it."

    "I'm not in the mood to write when faced with a pen and paper."

    Many students don't feel this is something to worry about. Now that it's more convenient and efficient to write on a computer, why bother to handwrite?

    Many educators think differently. Shi Liwei, the headmaster of a famous primary school in the capital said "Chinese characters enjoy both practical and aesthetic(审美的) value. But those characters typed with computer keyboards only maintain their practical value. All the artistic beauty of the characters is lost. And handwriting contains the writer's emotion. Through one's handwriting, people can get to know one's thinking and personality.

    Beautiful writing will give people a better first impression of them."

    To encourage students to handwrite more, many primary schools in Beijing have made writing classes compulsory(必修的)and in universities, some professors are asking students to turn in their homework and essays written by hand.

    They hide in trees, hang from helicopters, even follow people down on motorcycles—all so that they can snap a shot of a celebrity. They are paparazzi—photographers who make a living by taking pictures of the rich and famous.

    This September, California, a state with plenty of celebrities, passed a law aimed at taking action against paparazzi. The law forbids photographers from entering private property to take pictures, from using high-tech devices to take pictures of people on private property, and from "persistently following in order to take a picture." Violators can be fined or spend time in prison. The United State Congress is considering passing a similar law.

    Supporters of the California law say it will protect the privacy of celebrities, whom paparazzi have been bothering for years. Opponents (反对者) say the law restricts photojournalists from doing their job.

    Most celebrities seem to like having their pictures taken when they are in public at award shows or other events. After all, it's free publicity. But when they're not in public, they say, photographers should leave them alone. Yet paparazzi have been known to secretly look in windows and worse. Actor Michael J. Fox said that paparazzi have even "tried to pretend to be medical personnel at the hospital where my wife was giving birth to our son."

    Celebrities have as much right to their privacy as anyone else, supporters of the law state. Supporters further argue that the California law is a fair way to keep the press at bay, because the law still allows photographers to do their job. It only punishes them, supporters say, when they violate celebrities' privacy.

    Opponents of the law say it violates the First Amendment to the United States Constitution (美国宪法第一修正案), which guarantees that no laws will be made to limit "the freedom of speech, or of the press." Although some people might not consider paparazzi a part of the legal press, the California law does not single out paparazzi. It applies to photographers working for any publication.

    Opponents of the law are also concerned about its wording. "Does 'persistently' mean following someone for six minutes, six seconds, or six days?" asked lawyer Douglas Mirell. The wording of the law is too vague, critics complain, and could be used to punish almost any news photographer.

    The United States needs a free press to keep the public informed about important news, paparazzi law opponents say. Limiting the press in any way, they argue, limits the freedom of all.

Would you drink water that had once been flushed down a toilet? After it's been cleaned, that is. The climate is warming, and the population of drought-prone states California continues to grow. So recycling wastewater into drinking water may become a necessity.

But, it can be really hard for people to get over their disgust at the thought of drinking recycled water. People are grossed out by cycled water, because it was once wastewater—you know, the stuff that goes down your kitchen drains, your showers, your toilets. And even though it's cleaned up to a standard that is identical, if not better, than commercially bottled water, the key barrier to recycled water acceptance is people's disgust regarding it, " said Daniel Harmon, a psychologist in University of California.

In one experiment, the researchers had some participants watch a short video promoting water conservation. And in another experiment, they added a video explaining why recycled water might trigger disgust even though all pollutants have been removed. And neither video had a strong effect on people's willingness to drink recycled water or to support the practice.

The messages were not enough to get them to actually use recycled water more. "Disgust is such a powerful reaction that simply giving more information is not going to really be effective. " The study appears in the journal Basic and Applied Social Psychology.

Researchers say it's probably going to take a lot more to get people to embrace recycled water. For example, it might help to see members of their community drinking water that's gone, as it's called, from "toilet to tap, " with no ill effects.

It is clear that these kinds of more direct campaigns for acceptance are necessary to get people to get over that psychological barrier—to take that first sip, so to speak. Cheers!