Math & Technology

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leap second

To add a leap second on June 30, the official time will be 23:59:60 or 11:59:60 p.m.

inset of Mars from Mariner, Curiosity selfie

THEN AND NOW  The first fuzzy image of Mars (inset) from Mariner 4 in 1965 showed hints of clouds. This year, the Curiosity rover snapped a selfie while exploring Gale Crater.

This spore-powered engine is called a "moisture mill." It turns as bacterial spores, attached to the yellow polymer flaps, shrink and swell based on varying levels of humidity.

Math & Technology

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