常速英语

Keywords:

[SHANE CAMPBELL-STATON] Normally, more than 90% of female African elephants have tusks. But in places that have a history of poaching and trophy hunting, like in Gorongosa National Park...

Keywords:

Brendan Nash: So this is the sub-plow sediment from unit 133, and anything in here will have will be undisturbed for about 13,000 years. Really looking for the smallest flakes. And then you've got to ...

Keywords:

SPEAKER: The center of activity that brings your cells to life is found inside the dynamic mitochondria organelle. The inner mitochondrial membrane is coated with enzymes that catalyze th...

Keywords:

At this very second, you are on a narrow ledge between life and death. You probably don't feel it, but there's an incredible amount of activity going on inside you, and this activity can ne...

Keywords:

SPEAKER: There are several ways to test whether someone has been infected with SARS COV-2. Some tests can detect if you have an active infection or an infection that is happening right ...

Keywords:

Deep in tropical jungles lie floating kingdoms, ruled by beautiful and deadly masters. They're sort of the high elves of the ant kingdoms; talented architects that create castles and city...

Keywords:

[NARRATOR:] When you are infected with a virus like SARS-CoV-2, your body gets to work destroying the virus. Your immune system recognizes certain viral proteins, called antigens. Antig...

Keywords:

An observable universe is a big place that's been around for more than 13 billion years. Up to two trillion galaxies made up of something like 20,000 billion billion stars surround our home ga...