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MWC 922: The Red Square Nebula

What could cause a nebula to appear square? No one is quite sure. The hot star system known as MWC 922, however, appears to be embedded in a nebula with just such a shape. The above image combines infrared exposures from the Hale Telescope on Mt. Palomar in California, and the Keck-2 Telescope on Mauna Kea in Hawaii.

Africa in perspective

People often underestimaete quite how large Africa is, so we figured we’d put it in perspective by transposing as many of the world’s other countries over it as we could.

Comma story

It isn’t easy holding complex sentences together (just ask a conjunction or a subordinate), but the clever little comma can help lighten the load. But how to tell when help is really needed? Terisa Folaron offers some tricks of the comma trade.