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Biologists at the Massachusetts Institute of Technology have created a genetically modified version of a common bacteria found in the gut that can sense the environment there and fight disease. And when this designer bacteria works, the proof is in the poop - glowing poop. (In this case, mouse poop.)

7:26 animation on photosynthesis

Learn the fundamental concepts behind renewable energy sources and energy efficiency through these short videos.

Rate of photosynthesis