fruit ripening

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

brightest galaxy

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

tattoo

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

Cranium 17

FOUL PLAY  Cranium 17 was pieced together from 52 bone fragments fished from Spain’s Sima de los Huesos cave. Dating back 430,000 years, the skull exhibits signs of two traumatic injuries above the left eye, at least one of which proved fatal.



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