We can have conflicts with our important persons like friends, relatives, workmates, etc. But the conflicts doesn't necessarily mean that the relationship will be destroyed. In fact, sometimes conflict helps people to let out their silent feelings, allowing them to free their suppressed emotions. However, when in a conflict, we usually get angry and say or do things which aren't linked to the problem at hand. Therefore, it is important that we should try to avoid conflicts through effective communication.

    In a heated argument, we usually say things that aren't related to the real problem, and even use rude words to make sure we gain an advantage over the other person. Then the whole situation goes badly. So we should separate(隔离) the root cause of the problem and build our discussion around it. This ensures that there are no rude remarks and the situation moves in a positive direction.

It's easy for us to think we're right and if something isn't working out, it surely must be someone else's fault. However, if you aim to solve a conflict, first of all, you should show some respect and allow the other party to express themselves. Using remarks like, "I understand your concern on this" or "I know you're right at your end", would make the other person feel more appreciated.

    Sometimes some people get too excited and may behave in the wrong way or say something others may not appreciate. This can cause a worse situation. Actually, they should control their emotions and keep calm. This has to be learned through self-control and observing behavior of other people.

The tips mentioned above are useful for most situations. However, we don't rule out the possibility that there are some people always want to create some sort of trouble for others. You can tell them from others, and putting in an effort to resolve a conflict with them may just not be a wise idea. The best way to deal with these people is to forget them. A famous saying can help you and that is: "You should never fight with a pig; you both get dirty and only the pig likes it."

    Blind people usually possess one advantage over other people who can see. Their sense of hearing is far more acute. Bats, whose sight is poor, use a sound location system to help them avoid blocks in the dark. They send out pulses of sound waves, pitched at 50,000 cycles per second, far above the limits of the human ear, which can hear sounds up to frequencies of about 20,000 cycles per second. As the echoes bounce back off obstacles such as trees and walls, the bats are able to take proper action.

    The first steps to help blind people to see with sound are based on exactly the same principle. The sound is given off by an ultrasonic (超声的) torch, whose shape is different from a normal electric torch. It is double-barreled. It works in a similar way to a sonar (声呐) unit on a warship or submarine. The unit's transmitter sends out pulses of ultrasonic waves at the same frequency as the bat and the receiver picks up the returning echoes. Because these are still above the frequency at which the human ear can pick them up. The echoes are filtered (过滤) through circuits that turn them into “bleeps” which can be clearly heard before passing them into headphones.

    This means that a person holding the torch can point it ahead of him and scan the area for obstacles over a range of about 25 feet. If there are no return echoes coming through the headphones, then there is nothing in the way. If echoes do come back, then the closer the obstruction the faster the succession of bleeps and the deeper the pitch of each bleep. With practice, the torch could help a blind person to lead a more normal life.

    At present, the experimental ultrasonic torch requires a shoulder bag to carry the batteries, cables for the power supplies and earphones, as well as the torch itself. Fortunately, reducing the size of the electronic equipment is progressing and it should not be long before the whole set-up can be reproduced in a form small enough to fit into a pair of glasses. The wearer would face in the direction he wanted to check, and lift or lower his head just as a sighted person would.

    Dry Ice is a unique substance which has many uses. Essentially, dry ice is frozen CO2. The first report of what we now call dry ice came from the French chemist Charles Thilorier in 1834. In 1924, the Drylee Corporation of America named the solid form of CO2 as "Dry Ice", which is what it is popularly called today.

    At normal atmospheric pressure, CO2changes directly from solid to gas. It skips the liquid phase（阶段）which makes regular ice wet. Frozen CO2is also much colder than regular ice. But regular ice freezes at 32 degrees Fahrenheit, CO2 changes from gas to solid at -109.3 degrees Fahrenheit. This extremely cold temperature makes it very dangerous to handle with bare hands. It can cause frostbite in a very short period of time.

    Dry ice has been used for a variety of purposes throughout the past century. Its primary use is to refrigerate food when electrical refrigeration isn't available. Through the process of sublimation (when CO2 changes from solid to gas), it can maintain cold food for a long time.

    If you've ever been to a play and seen heavy fog on the ground, it is likely that you have seen dry ice in action. This effect can be achieved because CO2 is heavier than air, so evaporated （挥发的）CO2 will sink and accumulate on the ground.

    Another interesting use for this substance is to bait（诱杀）insects like mosquitoes. These insects have sensors which guide them to CO2. They find the high concentration of CO2 in dry ice quite attractive.

    Mars has long been a mystery for human beings. We have been looking for evidence of life on Mars. In the 1960s scientists guessed that the polar ice cap of Mars was made of frozen CO2. More recent observations have shown that while the topmost layer consists of frozen CO2, the most of it is probably regular frozen water.

    I was a very lucky girl.Many girls didn't know they could take part in or even be good at sports,but I never needed to be told that because I grew up with my grandmother who was a great Olympian.Even today,many girls need that extra nod in sports,but where can they get it?

    If you ask people to name the one person who had the greatest effect on the English language, you will get answers like "Shakespeare," "Samuel Johnson," and "Webster," but none of these men had any effect at all compared to a man who didn't even speak English-William the Conqueror.

    Before 1066, in the land we now call Great Britain lived peoples belonging to two major language groups. In the west-central region lived the Welsh, who spoke a Celtic language, and in the north lived the Scots, whose language, though not the same as Welsh, was also Celtic. In the rest of the country lived the Saxons, actually a mixture of Anglos, Saxons, and other Germanic and Nordic peoples, who spoke what we now call Anglo-Saxon (or Old English), a Germanic language. If this state of affairs had lasted, English today would be close to German.

    But this state of affairs did not last. In 1066 the Normans led by William defeated the Saxons and began their rule over England. For about a century, French became the official language of England while Old English became the language of peasants. As a result, English words of politics and the law come from French rather than German. In some cases, modem English even shows a distinction(区别)between upper-class French and lower-class Anglo-Saxon in its words. We even have different words for some foods, meat in particular, depending on whether it is still out in the fields or at home ready to be cooked, which shows the fact that the Saxon peasants were doing the farming, while the upper-class Normans were doing most of the eating.

    When Americans visit Europe for the first time, they usually find Germany more "foreign" than France because the German they see on signs and advertisements seems much more different from English than French does. Few realize that the English language is actually Germanic in its beginning and that the French influences are all the result of one man's ambition.

Upon the release of the publication "The Mountain People" by the American ethnologist Colin Turnbull in the year 1972, he characterized the subjects of his study—a Ugandan tribe known as the Ik—as "a populace devoid of affection." Turnbull, after a period of two years spent in observation, concluded that the Ik exemplified the primal tendencies of mankind: deceit, larceny, and a callous indifference to the suffering of others. However, when Athena Aktipis and her associates from the Human Generosity Project delved more profoundly into the matter, they discovered a society that engaged in the communal sharing of all resources. "Turnbull's observations coincided with a calamitous famine in Uganda. What he witnessed was merely a reflection of the dire circumstances that arise when individuals are gripped by hunger," Aktipis remarks. Yet, her research team uncovered that, despite the oppressive conditions they faced, the Ik held in high esteem the act of mutual assistance whenever it was within their means to do so.

Aktipis posits that the phenomenon of selflessness is more pervasive and advantageous than the field of evolutionary social science has historically acknowledged. "The prevailing assumption was that individuals are inherently inclined to act solely in their own interests or those of their kin," she states. By examining the distinctive and unselfish behaviors that have enabled nine communities across the globe to persist, the scholars from the Project aim to demonstrate that humanity is indeed capable of extensive collaboration.

The Maasai populace in Kenya offers a principal illustration of the Project's findings. They depend on reciprocal friendships to secure necessities such as sustenance or hydration during times of scarcity, with no expectation of reciprocation. Similarly, in the distant locale of New Mexico, while individuals frequently render aid in the transportation of livestock and receive support in kind, they will also provide assistance gratuitously in instances of adversity, such as personal injury or the bereavement of a cherished one.

Aktipis is convinced that the theoretical models she has refined through the study of these communities can be broadly applied to any interdependent systems. Her overarching ambition is to devise social-welfare frameworks that offer sustenance to all members of society. Take, for instance, the market-driven insurance models prevalent in the United States: They are priced according to individual risk factors, including health profiles and geographic location, which results in millions of Americans being priced out of coverage. In contrast, a system founded on the principles of communal support and pooled financial resources would distribute the burden equitably during collective trials, such as natural catastrophes and pandemics.