A collision may have left these galaxies without dark matter. That spells trouble for alternative gravity theories.

A mathematical mechanism enables AI models to process language at scale, undergirding the current AI revolution. Our ...

C.H. Waddington’s powerful image of embryonic stem cells specializing on a rolling landscape has captivated biologists since the 1950s. Experimental data is finally confirming, and complicating, his ...

Scientists assumed that energy flows in only one direction in a turbulent system. What they didn’t know, until they looked closely at brine shrimp, was that a simple factor can reverse the flow.