May. 23, 2008
Astronomers conducting observations of one recent supernova happened to have an orbiting observatory aimed in the right direction collecting data when they caught the first signs of a second supernova in the neighborhood, letting them watch the supernova
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From the Vault
Ira Asks: How Do They Make Eyeglasses?
You deliver your prescription to an optician, and they return with a pair of eyeglass lenses tailored precisely to your personal vision quirks. But how?