Efforts to measure the volume and depth of lakes often involve rowing a boat around a body of water and tediously collecting myriad measurements. As a result, estimates varied widely. A new model makes predictions that match well with available direct measurements, but portend more pollution problems.
Reporter Lynne Peeples discusses the health and environmental risks posed by the use of lead bullets — and the reasons they’re still so widely used. Also, Seth Mnookin on the anti-vaccine movement and storyteller Hillary Rea on what it’s like to be a standardized patient for medical students.