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Archaeologists set out recently to unlock one of the secrets of Stonehenge, the majestic monument in southern England－when were the first standing stones placed at the ancient religious site? The concentric stone circles that make up Stonehenge, 13
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Among all the primates, we humans are the only ones that stand on two legs. You may have seen other animals stand on two legs briefly, such as a cat or a dog. But they always return to their original posture. Even apes, who have arms and hands much l
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Last time we discussed how human beings are the only primate that walks on two feet. One theory for how this might have happened says that, when our species was just getting its start, reaching up for fruit was a good thing to be able to do. Those wh
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Amanda: Mike, can you please pass me the newspaper when you finish reading the sports pages? Mike: Actually, I checked the scores ages ago. Now I'm just reading my horoscope. I recently developed an interest in astrology. I make sure to read my daily
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Yael: They're months away, and I'm already stressed out about the holidays. Two different relatives of mine have died of natural causes on Christmas Day. You think my family's cursed? Don: If your family's cursed, Yael, then a heck of a lot of other
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With all the concerns about global warming and climate change one might ask the question, Why don't species just adapt? Don takes the devil's advocate position and discusses this with Yael. D: Yael, we know global warming is bad, right? I mean, the t
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The Kite Runner is an adaptation of the Khaled Hosseini novel, which told the story of how childhood friendship and betrayal played out when its characters became adults. The film starts in contemporary San Francisco, where an adult Amir looks on mor
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The world on April 22 observed Earth Day, an annual event meant to inspire awareness and appreciation for our planet's environment. But this yearly reminder has come under fire from some environmentalists, who say the excessive promotion of a one-day
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Mike: Hey, Amanda! How come you're wearing a suit? I've never seen you dressed so formally! Amanda: It's because I have a job interview this afternoon at the department store. I responded to a newspaper advertisement for a summer job by sending my re
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Why does blowing on hot soup help to cool it off? Its because of evaporation. Evaporation cools down a liquid because the most energetic molecules leap off the surface and leave the slower-moving molecules behind. Slower-moving means lower temperatur
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When people lose a hand, the part of the brain dedicated to that area receives no input at all. It becomes inactive. But the areas around it are still getting signals all the time. Some of those signals seem to leak over into the unused area. Just by
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By bending arms and legs or angling her bodypresenting more or less surface area to the groundshe can change her rate of fall, slowing or speeding up her terminal velocity around ten or twenty miles per hour. To fall as fast as two hundred miles per
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Acetylene and hydrogen molecules are disappearing from the atmosphere of Saturns moon, Titan. Its a mystery befitting Sherlock Holmes investigative skills, a mystery NASA scientists hope to crack. About fifty percent larger than Earths moon, Titan is
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The vampire is the stuff of the great horror stories. However, a recent textbook by geneticist John Jenkins suggests that Bram Stokers legend of the vampire, Dracula, may have had its basis in a very real disease that prevents some people from gettin
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Another sexual difference among mammals that doesnt hold with other animals is size. In most mammals the male is larger than the female, but in most other animals where there are two distinct sexes, the female is the larger one. Today scientists defi
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In mammals, the sex of a baby is determined by the combination of chromosomes it inherits from its parents. Nearly every cell in a male body has two different sex chromosomesone is shaped like an X and one is shaped like a Y. Females also have two se
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Perhaps the baby isnt hearing properly, or perhaps the problem is cognitive. Or, as is sometimes the case, the babys parents arent speaking to the baby enough. Because experts believe that while some capacity for language is ingrained, learning how t
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Perhaps the baby isnt hearing properly, or perhaps the problem is cognitive. Or, as is sometimes the case, the babys parents arent speaking to the baby enough. Because experts believe that while some capacity for language is ingrained, learning how t
英语时差8，16
The Oort cloud is a spherical haze of comets that surrounds our entire solar system. We often get the false impression that the solar system ends with Pluto. In fact, beyond Pluto is the Oort cloud, encircling everything else like an enormous shell.
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In this form of hereditary porphyria, the skin becomes white with anemia and very sensitive to light. (Remember that vampires only come out at night.) The teeth of Porphyria victims become reddish and even glow under ultraviolet light. Hair grows fas
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