In the fabric shop, the curtains are neatly arranged by style. The floral-patterned ones are in a section marked “Floral,” the plain ones are in a section...
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Where Is Cobalt Used? Can you think of any connection between a delicate Ming vase and a nuclear explosion? Difficult, isn’t it? And yet there is a connection in the...
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Why Is Blood Red? Blood gets its red color from a substance called “hemoglobin.” Hemoglobin has a molecule called a “heme” which has the metal...
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What Causes Black and Blue Marks? If you fall or receive a sharp blow, you may get a painful bump that soon turns black and blue. When you bruise yourself, tiny blood...
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Why Can’t We See the Stars in Daytime? The stars shine all the time, day and night. We do not see them in daytime because of the glare of sunlight. The sun’s...
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