carbon sink

UP IN THE AIR  Semiarid regions, like this area in Central Australia, may be responsible for the wild variations in the amount of CO2 left free in the atmosphere to warm the planet.

wolf fossil jaw

ANCIENT RIFT  DNA from a wolf (fossil jaw shown) that lived in Siberia some 35,000 years ago indicates dogs and wolves split earlier than thought.

magnet

STRETCHY MAGNET  Layers of roughly 40-micrometer-long magnetic cells inside an iron-gallium alloy, seen in this micrograph, enable the material to expand and contract in a magnetic field.

California two-spot octopus

SKIN THAT SEES  The California two-spot octopus (hatchling shown) can detect light with just its skin — no eyes or brain necessary — and respond with a color change display.



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