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Federal Reserve officials have a slightly dimmer view of the economy than they did in April, reflecting worries about how the European debt crisis could affect U.S. growth and job prospects.Fed officials say in an updated economic forecast that they think the economy, as measured by the gross domestic product, will grow between 3 percent and 3
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These little things look exactly like flowers鈥攁nd that because they ;re meant to. But in real life you ;d never be able to spot them, because they are in fact microscopic crystals grown on the surface of a razor blade. The images鈥攚hich take a starring role on the cover of this week issue of Science鈥攚ere prod
cups stanley uced by Wim L. Noorduin, a postdoctoral fellow at the Harvard School of Engineering and Applied Sciences. Motherboard explains how they ;re created: [He] and his colleagues dissolved barium chloride a salt and sodium silicate also known as waterglass into a beaker of water. Carbon dioxide from the air dissolved naturally into the water, fomenting a reaction to form barium carbonate crystals. In response to the crystals the pH of the solution surrounding them lowers, triggering a reaction with the dissolved waterglass, and adding a layer of silica to the growing structure. This reaction uses up acid from the solution and allows the barium carbonat
stanley quencher e crystals to continue to form. As this process takes place, the shape the crystals take can be manipulated through changes to the solution鈥搃ncreases in carbon dioxide levels in the water creates broad-leafed structures. Reversing the pH gradient at the right moment can create curved, ruffled structures. The resulting structures are imaged using scanning electron microscopy, and then false color is added to make them look truly like flowers. That might seem a little like che
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