Advanced light microscopy techniques have come into their own—and are giving scientists a new understanding of human biology and what goes wrong in disease.

John Flamsteed’s vision of an astronomer's skill set clashed with existing ideas about observing, paving the way for a new mindset based on mechanical objectivity.

From ancient Egypt to post-industrial London, societies have long recognized the benefits of clean water and—mostly—have done what they can to provide it.