教育学习   常速英语

Keywords:

So termites build these huge, huge mounds. And inside the mound, there's a great deal of activity that's going on. So termites go out. They forage for plant material, which they find in actual...

Keywords:

KEN DIAL: The evolution of flight in birds has long been a great scientific puzzle. Fossil evidence from the past 40 years has established that birds descended from theropods-- a linea...

Keywords:

Skin covers all our bodies, but its color varies from person to person. To understand why, we need to peer inside its layers. [music plays] Skin cells and their allies--hair, sweat an...

Keywords:

ANTHONY BARNOSKY: Species do not last forever. You can think of species a lot like you think of a human lifetime. They have a beginning and they have an end. SPEAKER 1: Anthony Barnosky...

Keywords:

Corals are small animals, but they build structures that you can actually see from space. And as we zoom in we see the reefs where I work on a little island called Ofu in American Samoa, ...

Keywords:

There's a cross-section of that sort of tower, which is known as a villus. And the villus is lined by cells on the outside that are the fully differentiated cells that play an important...

Keywords:

Everything that you can actually see with your eye is just the smallest sliver of life on this Earth. Most of life is invisible. We still have this idea that we're the most central ...

Keywords:

DNA sequencing technology has been revolutionized in the last several years, not only in the price-- it's no longer cost prohibitive to dream of any kind of sequencing project--but also the depth at w...