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MATH TREK
Economists say auction-based purchasing could create market chaos. See Julie Rehmeyer’s column “Devil is in the details of a new Medicare plan to buy medical supplies.”

SCIENCE NEWS FOR KIDS
Research in guinea pigs finds a way to power small electronic devices using a voltage difference in the inner ear. Read more in “Your head’s battery.”

RANDOMNESS
Tom Siegfried’s column “Maybe there’s a way to find out if reality is a computer simulation” explores how computers describe the universe.

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