Why Does Skin Color Vary?
Why Does Skin Color Vary? People vary in the color of their skin because of a network of pigment-forming cells called melancoytes. This network is interspersed between,...
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What Is Photosynthesis?
What Is Photosynthesis? Photosynthesis is the process by which green plants make food for themselves-and, indirectly, for all animals, including human beings. In...
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Why Is Grass Green?
Why Is Grass Green? The green color in grass-and in most other plants-comes from chloroplast within the cells, each of which contains four different colors or pigments....
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Why Does Paper Turn Yellow with Age?
Why Does Paper Turn Yellow with Age? Oxidation causes paper to turn yellow with age. Most paper is made of plant fibers that have been bleached white. After a time, the...
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Who Invented the Solar Battery?
Who Invented the Solar Battery? Gerald Pearson, Calvin Fuller and Daryl Chapin invented the first solar battery which converted the Sun’s energy to electricity in 1954....
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