By Elisabeth Rosenthal – I still remember exactly where I was sitting decades ago, during the short film shown in class: For a few painful minutes, we watched a woman talking mechanically, raspily through a hole in her throat, pausing occasionally to gasp for air. The public service message: This is what can happen if you smoke.

By Elisabeth Rosenthal – How can we know when to reopen society without testing many more people? President Donald Trump said late last month that he hadn’t “heard about testing in weeks.” But today — let’s face it — tests are being rationed in many parts of the country.