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O'Keefe painting

PIMPLED PAINTINGS  Many oil paintings by Georgia O’Keeffe, including this 1941 work titled “Pedernal,” are slowly being damaged by a type of “acne” forming under the paint.      

pollen shapes

PATTERNS APLENTY  Pollen from flowering plants comes in myriad shapes (as seen in these scanning electron microscope images, gray). Computer simulations based on a physics process called phase separation reproduced the grains’ shapes (orange).

yaks in Mongolia

MODERN MILK  Seven species of animals, including yaks (shown), are milked in Mongolia today; recent research suggests that yaks were milked in the region 3,000 years ago, too.

Mars ice caps

WARMED FROM WITHIN?  Mars has frigid polar ice caps. But a theoretical underground chamber of magma could help melt ice near the south pole, creating what some scientists think is a lake hiding under the ice.



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