Material Witness
In the fabric shop, the curtains are neatly arranged by style. The floral-patterned ones are in a section marked “Floral,” the plain on
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Blue
Where Is Cobalt Used?
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 t
Why Is Blood Red?
Why Is Blood Red? Blood gets its red color from a substance called “hemoglobin.” Hemoglobin has a molecule called a “heme” which has the met
What Causes Black and Blue Marks?
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 b
Why Can’t We See the Stars in Daytime?
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