标签：Digest 相关文章
Ontario plans to join British Columbia in regulating traditional Chinese medicine and acupuncture by the end of the year. Ontario Health Minister George Smitherman made the announcement Friday, as a government-appointed panel released its recommendat
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Don: Some people seem to need significantly less sleep than others. Yael: Tell me about it. I have a friend who swears that she sleeps only five hours a night. If she's telling the truth, then she must be bionic. She seems to have plenty of energy, a
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Chattering Chimps We talk to our house pets all the time, but wouldnt it be great if your cat could answer you in English? Well, maybe it wouldnt be so great! We tend to assume that, because they dont speak human language, other animals are dumb, or
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Sleeping With One Eye Open Theres an old saying that if you think youre in danger, you might ought to sleep with one eye open. Well it turns out that many kinds of birds do just that. A group of scientists at Indiana State University studied mallard
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Out for the Count 失去知觉之后 If youve ever had major surgery, you probably remember lying down and waking upbut nothing in between. Thanks to the anesthesiologist, during the actual surgery you were out of it: immobilized and insensitive to p
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Volcanos and Water Firefighters use water to battle a towering inferno.You might wonder if water could also stifle an erupting volcano. Actually, this experiment happens every time a volcano erupts at the bottom of the ocean. What happens when a volc
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Why Are Nights More Calm Compared To The Day? More often than not, the wind dies down at night after a blustery day. Where does the wind go? Why are nights generally more calm than days? The difference between calm nights and windy days is the sun. D
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What Are Solar Tornadoes? Large, Earth bound tornadoes are pretty impressive weather events. Those dark, giant funnel clouds inspire much awe and fear. But theyre nothing compared to so called solar tornadoes solar gases swirling in monstrous formati
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Greek Island Shows Signs Of Volcanic Unrest Fira is a typical Greek city overlooking the Aegean Sea. Sitting atop a twelve hundred foot cliff on Santorini Island, its an ideal vacation spot. But this island wasnt always a paradise. Thirty five hundre
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The ozone layer is thinner than it used to be. This fact has motivated humans to keep themselves protected from the suns ultraviolet, or UV, rays. But just because we can protect ourselves from these rays doesnt mean that they dont still existthey ex
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The Heat Is On 热传递，是热从温度高的物体传到温度低的物体，或者从物体的高温部分传到低温部分的过程。热传递是自然界普遍存在的一种自然现象。只要物体之间或同一物体的不同部分之间
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On The Prowl 猫是一种地盘性的动物，它们喜欢在外面与别的猫划分领地。公猫比母猫尤为如此公猫的领地可能会是母猫领地的十倍。猫划份地盘是与其自然天性有关的。对于一只野猫来说，占领
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Coextinction 绝种是指生物群体逐渐消失的过程。物种和较大族群常态性的灭绝，并由更进步的形式所取代，这是进化的正常过程。然而，从化石的记录来看，有时会出现整个科目的动物和植物都
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A Hyenas Sibling Rivalry 鬣狗，学名Hyaenidae，哺乳动物，是体型中等、生活在非洲、阿拉伯半岛、亚洲和印度次大陆的陆生肉食性动物。它们同属于一科：鬣狗科。外形略像狗，头比狗的头短而圆，
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Body Dysmorphic Disorder Are you unhappy with your body? Learn about body dysmorphic disorder on this Moment of Science. Psychologists estimate that one to two percent of the population has what is called body dysmorphic disorder. These people obsess
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Rapid Evolution and Population Dynamics 种群（population）指在一定时间内占据一定空间的同种生物的所有个体。种群中的个体并不是机械地集合在一起，而是彼此可以交配，并通过繁殖将各自的基因传给
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What Is a Hypnotic? 失眠，指无法入睡或无法保持睡眠状态，导致睡眠不足。又称入睡和维持睡眠障碍(DlMS)，祖国医学又称其为不寐、不得眠、不得卧、目不瞑，是以经常不能获得正常睡眠为特征的
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Oceans Most Wanted 伴随着人们的经济活动和国际交往，一些物种由原生存地借助于人为作用或其他途径移居到另一个新的生存环境并在新的栖息地繁殖并建立稳定种群，这些物种被称为外来物种。
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Grow Your Own Dentures 种植牙也叫人工种植牙，并不是真的种上自然牙齿，种植牙而是通过医学方式，将与人体骨质兼容性高的纯钛金属经过精密的设计，制造成类似牙根的圆柱体或其他形状，以外
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Methuselah Insect 昆虫的寿命相对于地球上的其他生物而言，算比较短的，不过有一种昆虫的寿命相当长，那就是一种能17年的蝉。蝉寿命虽长，却要在土里面沉睡17年，当它睡醒之后，从土里钻出
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