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. 

tattoo

SCRATCH THAT  Tattoos can irritate the skin for years; red ink may be the most aggravating color. 

brightest galaxy

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

fruit ripening

GETTING READY  Ethylene, a gas, acts as a plant hormone. It tells fruits to ripen, roots to grow and seeds to germinate.



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