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Why Are Some People Double-Jointed? Can you bend your thumb backwards until it touches your wrist? If you join your hands behind your back, can you lift them over your head without letting go? If you can, you might be what some people call double-joi
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When humans have a heart attack, heart muscles die after being cut off from their blood supply. But what if the heart could grow new muscle to replace the dead tissue? Some amphibians can regrow body parts, even entire limbs. But humans and other hig
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3-D Technology Saves Lives 3D技术拯救生命 From VOA Learning English, this is the Health Report. Three-dimensional technology -- known as three-D -- gives depth to objects that would otherwise appear two-dimensional, or flat. Three-D makes movie
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Researchers have identified a link between dementia and the brain damage that can occur in older people with high blood pressure and other forms of cardiovascular disease. High blood pressure, high cholesterol, and other conditions that affect blood
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Lesson 138 Regular 1. You must have a regular diet. 2. She is a girl with a regular figure. 3. You are one of our regulars. 4. He has no regular work. 5. I will apply for the job through the regular channels. 6. This is an irregular mess. 7. I'm not
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Beating Heart Tissue from Stem Cells In a study in the journal Science, researchers explain how they used mouse embryonic stem cells and microchip technology to create heart muscle tissue that actually beats. Cynthia Graber reports One of the goals o
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