含中文字幕节目   

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A, C, G, and T. Adenine, cytosine, guanine, and thymine. These are the four chemical building blocks of the DNA molecule. They are components of nucleic acid, which gives DNA its ton...

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United States. Environmentalism under fire. Soaring emissions. The rhetoric about environmental controls killing jobs is getting louder and louder. Isn’t it strange, Republicans retort, that peop...

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In some ways,the nineteen eighties seemed like the opposite of the nineteen sixties.The sixties were years of protest for social justice and change.Many Americans demonstrated against the Vietnam War....

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Squyres: Spirit is now hunker[ed] down due to winter. Spirit is deep in the southern hemisphere of Mars and what that means is winter is pretty tough, and so what we've done is we have parked the vehi...

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Have you ever been in an argument about nuclear power? We have, and we found it frustrating and confusing, so let’s try and get to grips with this topic. [Intro] It all started in the 1...

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War. Fighting. Hate. Prejudice. Peace. Understanding. Respect. Tolerance. November 16 is the International Day for Tolerance. But what exactly does the word “tolerance” mean? The group interna...

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Fat cats and corporate jets. Why is it so unrewarding for politicians to bash the rich in America? THE corporate jet gets a lousy press. In the James Bond classic, “Goldfinger”, the eponymous vill...

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Steve: Hi Dr. Gaby, how are you? Gaby: I'm very well, thanks Steve. Steve: Enjoying the cruise? Gaby: I am having a terrific time. Yeah, this is too much fun. It's going to be hard to go home...