Astronauts inhale oxygen and exhale carbon dioxide, just like you and me. On Earth, where exhaled air warmed by our bodies naturally rises away from us, the possibility of inhaling too much carbon...
鈥淒og Rocks鈥� are supposed to solve the problem of grass dying from dog pee. Urine contains a variety of nitrogen compounds, mostly metabolites of protein in food. These are effective fertilizers,...
Everything has a birthday. It鈥檚 the same day, about 13.77 billion years ago. Scientists claim that they are 99% certain that this is the age of our entire universe. But how could they possibly know...
Silver is more than just an object of beauty.聽It鈥檚 the stuff of memories.聽Prior to digital photography, all picture taking relied on compounds of silver.聽The reduction of silver ions to metallic...
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