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2023-09-10   Video
Biology of SARS-CoV-2 - Infection

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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...


2023-09-09   Pre-Intermediate
The Short Story 'After Twenty Years,' by O.Henry

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The cop moved along the street, looking strong and important. This was the way he always moved. He was not thinking of how he looked. There were few people on the street to see him. It was only about ...


2023-09-06   Video
Photosynthesis- Part 7- Biosynthesis

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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...


2023-09-02   Video
Photosynthesis- Part 6- Calvin Cycle

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The Calvin cycle takes place in the chloroplast’s stroma, the watery clear fluid surrounding the thylakoids. It’s helpful to think of the Calvin cycle in three phases: fixation, reduction,...


2023-08-25   Video
Photosynthesis- Part 4- Chloroplasts

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Lets take a closer look at a chloroplast, the organelle where photosynthesis takes place. Photosynthesis consists of two sets of chemical reactions: the light reactions and the Calvin cyc...


2023-08-21   Video
Photosynthesis- Part 3- Leaf Structure

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We are going to zoom in on a cross section of a leaf to have a closer look at the center of action for photosynthesis. A leaf has many different types of cells, such as mesophyll cells,...


2023-08-20   Pre-Intermediate
Should Parents Use Hitting as a Form of Punishment - Ⅱ

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Nearly one hundred parents have been through this program. Rose Berge believes that their work has been effective in changing the community. “It has helped people talk about punishing children. The...


2023-08-18   Pre-Intermediate
Should Parents Use Hitting as a Form of Punishment - Ⅰ

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What do you do when a child misbehaves? What if he does not listen? What if she breaks your house rules? All parents must face these questions at some time. All parents teach their children right a...


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