After the violent earthquake that shook Los Angeles in 1994, earthquake scientists had good news to report: The damage and death toll(死亡人数) could have been much worse. More than 60 people died in this earthquake. By comparison, and...

Cancer is feared by everyone. And this fear is reaching epidemic(流行性) proportions. Not the disease itself there is no such thing as a cancer epidemic. Except for lung cancer, mostly caused by cigarette smoking ,the incidence rates are...

Until the 1980s, the American homeless population comprised mainly older males. Today, homelessness strikes much younger part of society. In fact, a 25-city survey by the U. S. Conference of Mayors in 1987 found that families with children...

The greatest contribution to civilization in the century may well be the air-conditioning- and American leads just as amazing is the speed with which this situation came to be. Air-conditioning began to spread in industries as a production...

Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, and offer him companionship; some give protection, and some do hard work which man cannot do for...

Our quarrel with efficiency is not that it gets things done, but that it is a thief of time when it leaves us no leisure to enjoy ourselves, and that it strains our nerves when we try to get things done perfectly. In building bridges, Ameri...

Now let us look at how we read. When we read a printed text, our eyes move across a page in short, jerky movement. We recognize words usually when our eyes are still when they fixate. Each time they fixate, we see a group of words. This is...

Upon reaching an appropriate age (usually between 18 and 21 years), children are encouraged, but not forced, to leave the nest and begin an independent life. After children leave home they often find social relationship and financial suppor...

Baekeland and Hartmann report that the short sleepers had been more or less average in their sleep needs until the men were in their teens. But at about age 15 or so, the men voluntarily began cutting down their nightly sleep time because o...

Chinese output set to depress steel valuations Steel company valuations are poised for a fall as increased Chinese output is cutting its reliance on imported supplies. China，for long the main driver of surging demand， is making more of...