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.

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. 

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.

triboelectric nanogenerator w/voltage graph

POWER SQUEEZE  With a squeeze, swing or jiggle, body motion can flex a triboelectric nanogenerator (left) to create voltage (right), which can charge implantable and wearable medical devices. Textured surfaces within the generator can boost the power output.



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