Since the last Kepler catalog was released in February 2012, the number of candidates discovered in the Kepler data has increased by 20 percent and now totals 2,740 potential planets orbiting 2,036 stars. Image by NASA. In case…

In a regular column on the PBS NewsHour website, Dr. Howard Markel, director of the Center for the History of Medicine at the University of Michigan, will highlight the anniversary of a momentous event that continues to shape modern…

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