常速英语

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This is a 3D model of a DNA molecule. It is made up of two strands that form a double helix. If we unwind the helix, we can see that each strand is a chain of building blocks called nucleotides. Le...

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How would you describe the Universe-- infinite, eternal? How about smooth versus bumpy? In other words, why isn't all of the matter in our Universe clumped together in one big ball, or convers...

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Dengue virus is an RNA virus. Its outer surface is covered with envelope proteins surrounding a lipid bilayer envelope. Inside the envelope is a capsid shell that contains the virus’s RNA genome. Immu...

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Imagine a future where your toaster anticipates what kind of toast you want. During the day, it scans the Internet for new and exciting types of toast. Maybe it asks you about your day, and want...

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Alright so now we're going to go into a little bit more detail on Dengue virus since it's once the subjects of our talk today. If you rotate it very carefully, I'm going to highlight for you the penta...

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It's just like a white desert for as far as you can see. There is absolutely nothing and you come back and it's overwhelming. Between 2016 and 2018 Dr Tim Heitland spent 14 months in antarctica ...

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Like all young mammals, human infants depend on milk for nutrition. Milk is rich in lactose, a disaccharide made from two sugar molecules. Lactose cannot be directly absorbed in the small intestine. T...

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Mutations arise at random in a population. Suppose a mutation arises that causes adults to produce lactase in a population that doesn't have any dairy cows. Adults don't drink milk, so producing the l...