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(KATHMANDU,Reuters) Erik Weihenmayer, a 32-year-old American, recently became the first blind person to scale the 29,000-foot high Mount Everest. (路透社加德满都电)三十二岁的美国人艾瑞克.威亨麦尔日前成为第一位登上两
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By Ernest Leong Washington, DC 01 September 2006 watch Hollywood Movie Stars There's an old show business saying, There's no such thing as bad publicity. But some A list, or top tier, Hollywood movie stars have been getting a lot of negative press l
Frost-free Freeze Physics 昇華是指一种物质从固态不经过液态直接转化为气态的过程,是物质在温度和气压低于三相点的时候发生的一种物态变化。与昇華相反的过程称做凝華,指物质从气态直接变
Dont Try This at Home! Heres a hypothetical scenario that is to remain hypothetical. In other words, dont do this. Okay. Youre cruising along a desert highway in your souped-up roadster, leaving the roadrunners in the dust. Unfortunately, you are not
Why Frisbees Fly With a gentle flick of the wrist on a warm summer day, you can launch a frisbee on a long and graceful flight. Why do they fly so well? One reason is something called gyroscopic force. This is the tendency of a spinning object to mai