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Financial experts agree that part of the economic slowdown over the last few years can be attributed partly to the demise of the so-called dot-coms. Investors threw lots of cash at these start-up internet businesses, despite having no clear idea of h
The complex vocalizations of songbirds are learned, not inherited. Some even have regional accents. Wrens, thrushes and other songbirds don't hatch with their impressive musical talents. They learn to sing their extensive repertoires by listening to
President Bush says the key to a strong economy is the creation of more small business. But statistics show that most startups are doomed to fail. However, the experts agree that with planning and hard work a new company can beat the odds. This morni
要做医学扫描,或者取报告前,人们或多或少都感到紧张,为自己的身体状况感到担忧,这就是扫描焦虑症。 Scanxiety is the anxiety experienced while waiting to undergo a medical scan or receive the results of on
211. He is in bed. 212. Whats the matter with him? 213. He has a fever. 214. You have a bad cold. 215. You better stay in bed. 216. Its too bad. 217. I have a headache. 218. Lets call the doctor. 219. Let me take your temperature. 220. You must have
In the 17th century, the French scientist Pierre Gassendi knew that light traveled faster than sound. When a gun fired far away, he could see the flash of gunshot long before he heard the report. Gassendi tried to measure the speed of sound by clocki
最理想的练习口语的方法是有个说英语的外国人天天在你身边陪你说英语,但这个条件一般谁也不具备,那么怎么来练习口语呢,有一个好办法非常可行,就是自己和自己说练习英语口语(当
Cloning Pets Is animal cloning for real? I want to have my cat cloned. Well, animal cloning technology exists, but pet cloning isnt quite there yet. And it may never be. Why not? I could think lots of people could want to have copies of their pets. T
The Ant and the Dove An ant went to the bank of a river to quench its thirst, and being carried away by the rush of the stream, was on the point of drowning. A dove sitting on a tree overhanging the water plucked a leaf and let it fall into the strea
TED(指technology, entertainment, design在英语中的缩写,即技术、娱乐、设计)是美国的一家私有非营利机构,该机构以它组织的TED大会著称。TED诞生於1984年,其发起人是里查德沃曼。 讲师: 丹尼
Ant Attack! Imagine this. Youre coming home to your gated community after a long day of work. As you stop to show the guard your ID, a mugger jumps out from behind a bush and grab s you by the mouth. Okay, that last part sounded a little weird, but t
Hi there, I'm Ore with the BBC World News for Children. It's Tuesday the 1st of June. Coming up: The latest attempt to plug the American oil leak has failed. World Cup teams are picked. And a Japanese teenage girl is a baseball hit! First - the Unite
Bat Spit 蝙蝠的唾液 Anyone who reads gothic fiction will tell you that vampires are bad news. People who read modern medical journal s , however, might disagreein fact, they think vampires just might help save lives. The kind of vampire Im talki
Bedtime Blues 尿床的困扰 Never a happy topic, bed wetting is a very distressing problem for five to seven million American kids. If we cant explain why some people like to pick on these kids, can we at least shed some light on what causes bed we
The Parts of Metabolism 新陈代谢到底是什么? What is metabolism really? Statements like he can eat a lot because he has a fast metabolism are somewhat misleading. Metabolism isnt about the digestion of food in your stomach; its the name giv
Nutrigenomics 营养基因组学(nutrigenomics 或nutritional genomics,又叫营养遗传学 nutrigenetics)是研究营养素和植物化学物质对机体基因的转录、翻译表达及代谢机理的科学。 膳食是影响人体健康最重
The Denatured Egg White 煮鸡蛋还有那么多学问哪?在煮鸡蛋过程,鸡蛋会发生哪些变化呢? 蛋白质变性(protein denaturation)是指蛋白质在某些物理和化学因素作用下其特定的空间构象被改变,从而导致
Acanthostega 这种生物已经演化出前后肢,但每肢都有8趾。这种生物是从鱼类进化到两栖类的过渡产物。而且,它具有更多的鱼类特征,如有鳃、鳍和只能在水中起作用的感官。伦敦自然历史博
Nice Set of Pipes 尽管管风琴对我们来说还是比较生疏的乐器,但它的发音原理与我国民间流传至今仍在使用的古老乐器芦笙十分近似。据史料记载,公元前250年前古希腊工程师克提西比奥(Ktes