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How long will extraterrestrials have to keep twiddling their thumbs (or equivalent alien digits) waiting for humanity to call? According to NASA chief scientist Ellen Stofan, probably not long. At a... read more
Introduction When two metals having different electrical potentials are placed in a solution of an electrolyte (such as a lemon or an orange, with its high concentration of citric acid), a crude... read more
>>> Written by Steve Spangler. Use a magnet to prove that there really is iron in your breakfast cereal. The next time you're eating a big bowl of breakfast cereal, take a closer look at... read more
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