常速英语

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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...

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[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...

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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...

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SPEAKER 1: The SARS-CoV-2 genome is a single strain of RNA with genes that encode fewer than 30 proteins. This is less than 0.1% of the proteins encoded by the human genome. The viru...

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They can be very elusive and quiet and secretive until they're not. I think it's neat that Detroit is, as far as I know, as far as anybody that I've talked to knows, Detroit's the only city that has ...

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SPEAKER: This is the virus SARS-CoV-2. Its name stands for Severe Acute Respiratory Syndrome Coronavirus 2. You may have heard it called just the coronavirus, or COVID-19. Coronaviru...

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The Sun, smooth and round and peaceful. Except when it suddenly vomits radiation and plasma in random directions. These solar flares and coronal mass ejections, or CMEs, can hit Earth an...

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G3P, the net product from the Calvin cycle, can be used to generate other organic molecules, such as sucrose or starch. Sucrose produced by leaf cells is transported through the vascula...