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Butler was one of 416 AAAS members nominated this year as fellows by their peers. He was recognized for distinguished contributions to the field of experimental particle physics, particularly for pioneering experiments in heavy flavor physics, and the leadership of large international experimental collaborations. New fellows will be presented with an official certificate and a rosette pin on Saturday, Feb. 16, 2019, during the 2019 AAAS Annual Meeting in Washington, D.C.

Gravitational lenses

Predicted by Einstein and discovered in 1979, gravitational lensing helps astrophysicists understand the evolving shape of the universe.

From GED to PhD

Physicist Kira Burt dropped out of school at 16. Now she teaches students that anyone can be a scientist.