含中文字幕节目   

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So what you're seeing first, this is just DNA in the bacterial cell. And we've color-coded the genes. So that's the LUX operon. There's five genes in that operon. And somewhere else ...

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Pecos Bill had one of the strangest childhoods a boy ever had.It all started after his father decided that there was no longer enough room in east Texas for his family."Pack up,Ma!" he cried."Neighbor...

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As a student in Berlin, he irked Hitler by refusing to meet him. In 1938, as Austria’s leaders quailed before the Anschluss, the Habsburgs’ scion offered to return and rally resistance. Luckily, he di...

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Steve: Moyukh Chatterjee also goes to High Technology High School in Lincroft, New Jersey. Chatterjee: Well, basically for a while now, I've been interested in efficiency in industry. I really want t...

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Never before in history, have there been so many people on Earth as right now. Our numbers have skyrocketed, from 1 billion in 1800, to 2.3 billion in 1940, 3.7 billion in 1970, and 7.4 billion in ...

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If only his great-uncle had died earlier. Franz Joseph I was a masterful ruler of the Austro-Hungarian empire, but his 86 years brought rigidity when the times called for reform. This doomed the noble...

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My son is called Sam. He is sixteen years old. Sam has always been interested in lizards and reptiles. Most people do not like them very much. But Sam loves cold blooded creatures such as snakes, geck...

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Sruti: I studied the effect of cell phone and Bluetooth devices on simulated driving performance. Steve: And why did you decide to do this study and what did you find? Sruti: I started to conduct a ...