If you want to read the same story without the annoyingly ignorant JS Overlay, try here: http://www.npr.org/sections/health-shots/2017/01/12/509487126/flipping

If you want to read the same story without the annoyingly ignorant JS Overlay, try here: http://www.npr.org/sections/health-shots/2017/01/12/509487126/flipping-a-switch-in-the-brain-turns-lab-rodents-into-killer-mice http://www.npr.org/sections/health-shots/2017/01/12/50948712...