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Invisibility, an existential idea.
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It has always been puzzling why the Moon's face directed towards Earth and the one we never see are so totally different. One is mostly flat with craters while the other is mountainous. A new study published from research by USA and UK astronomers now proposes an answer. Early in its evolution-- maybe 4 billion years ago when the Moon was still forming from a collision between the Earth and a Mars size planet --a second, smaller rocky mass came together in a slow-motion splat to form the ...
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If you own a cell phone, laptop computer, hybrid car, or virtually any other digitally controlled device, you own some rare earth metals as well. Strange elements like scandium, yttrium, lanthanum, neodymium, and dysprosium are ingredients in all these products. The name dysprosium-- from the Greek "dysprositos" meaning "hard to get" --says it all. I use a cell phone, work a good deal on a computer, and could probably find a use for a hybrid car so I'm a culprit in the mining of these rare ...