教育学习   

Keywords:

Zebrafish, which any of you who are fish fanciers keep in the fish tank, can get to be about two inches long. It's got a little heart with just two chambers one atrium and one ventricle an...

Keywords:

Steve: Dr. Wilczek—thanks very much for talking to me today. Wilczek: My pleasure. Steve: Let's get to the most important thing for us. How is your opera career going? Wilczek: (laughs) My opera ca...

Keywords:

Show us the nuclear transfer we'd seen before， but now we're going to see it as an example where a skin cell nucleus is going to be used to make an embryonic stem cell. So the egg cell has...

Keywords:

Angst for the educated. A university degree no longer confers financial security. MILLIONS of school-leavers in the rich world are about to bid a tearful goodbye to their parents and start a new l...

大学毕业生的担忧 大学学历已经不再保证金融安全 发达国家数百万的高中毕业生将要含泪告别他们的父母，开始新的大学生活。有些人被纯粹热爱学习鼓舞着。但是大部分人同样相信在大学待三、四年，虽然在这个过程中累积了大量的债务，但他们获得高...

Keywords:

We're going to have a look at the way in which an amputated limb grows over the course of about 90 days in a salamander. That's a time-lapse movie， watching that thing grow. And now we're ...

Keywords:

I am a very old man.How old I do not know.It is possible I am a hundred,maybe more.I cannot tell because I have never aged as other men do.So far as I can remember,I have always been a man of about th...

Keywords:

Planet Earth is the home of every lifeform, known to us, in the universe. Its age is about 1/3 of the age of the universe and, admitted, It is a thing of beauty. a slightly squashed fai...

Keywords:

Imagine you are walking by the sea. You feel the soft white sand under your feet. You breathe in the fresh sea air. The sounds of nature make you feel peaceful. But then ... A group of young people...