Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.
A wave of political assassinations has swept across Mexico during this election season. One candidate was violently killed on her first day of campaigning.
Mammograms should start at age 40, according to the U.S. Preventive Services Taskforce. And a new study finds hormone therapy for menopause symptoms is safe.