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2022-12-10   Video
Malaria - Human Host

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The malaria parasite is an ancient organism. It has been with us since before we were human. Famous victims include Alexander the Great Genghis Khan and George, Washington. The malaria lifecy...


2022-12-09   Pre-Intermediate
Rappaccini's Daughter - Ⅰ

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Many years ago,a young man named Giovanni Guasconti left his home in Naples to study in northern Italy.He rented a small room on the top floor of a dark and ancient palace.Long ago, the building had b...


2022-12-06   Video
Malaria - Mosquito Host

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[NARRATOR:] Mosquitoes are usually vegetarian, preferring to drink nectar, fruit juices, and honeydew. Only a pregnant mosquito will bite humans, seeking nutrients from blood to nourish he...


2022-12-02   Video
Evolution of the Stickleback Fish

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SEAN CARROLL: For tens of thousands of years, much of North America lay buried under ice up to a mile thick. Then the massive ice sheets receded. In what is now Alaska, ocean bound stream...


2022-11-28   Video
Plate Tectonics

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So the basic concept is that heat inside the Earth drives motions. We have convection currents, through which heat is dissipated from the interior of the Earth. Those convection current...


2022-11-24   Video
How To Find a Dinosaur

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TYLER LYSON: Even though I've collected thousands and thousands of dinosaur bones and other fossils, every fossil that I find, it's just quite a thrill because you're the first person ...


2022-11-20   Video
Greenhouse Effect

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Earth’s temperature is affected by a process called the greenhouse effect, which is how the atmosphere keeps our planet’s surface warm. This process begins with energy from the sun, which is m...


2022-11-16   Video
The Geologic Carbon Cycle

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[SCHRAG:] OK. But that still doesn't really answer our question. It doesn't really explain how did Venus this get this way, why is Mars this way, and why has the Earth persisted in this...


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