upper jaw with teeth

LUCY’S RELATIVE  Fossils discovered in Ethiopia, including this partial upper jaw with teeth, come from a hominid species that lived alongside Lucy’s species between 3.5 million and 3.3 million years ago, researchers say. 

Twins

MATCHED PAIR  Studies of more than 14 million sets of twins indicate that human traits, on average, are dictated equally by genes and environment.

brightest galaxy

WEAR SHADES  Light pours out of the brightest known galaxy (illustrated), which is about 350 trillion times as bright as the sun. 

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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