guppies!

GUPPY GAINS Trinidadian guppies from the Guanapo River basin (shown) make unhelpful changes in gene activity when they first enter a new environment. Those missteps speed up evolution, a new study suggests.

junk food

GUT BUDDIES  Diets rich in fast food can mess with people's gut bacteria. These microbes may play a bigger role in health problems such as obesity and diabetes than scientists once suspected.

pair of supermassive black holes

BOSOM BUDDIES  A pair of supermassive black holes might live in the heart of the galaxy Markarian 231, shown in this Hubble Space Telescope image. 

New Guinea pottery

HIGHLAND MIX  Pottery fragments (far right) found in New Guinea are more than 3,000 years old, suggesting to researchers that island natives — who also made various stone implements (center and left) — influenced an Asian seafaring culture that spread eastward.



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