What is the deal with Covid? Vaccines? Masks? What works? What doesn't work? Who *are* the unvaccinated? What is vaccine apartheid? What's the deal with boosters? Dr. Adam Gaffney answers your questions. He is a physician, writer, public health researcher, and advocate. He practices pulmonary and critical care medicine at the Cambridge Health Alliance and is an Assistant Professor in Medicine at Harvard Medical School. His research focuses on healthcare financing, reform, and equity, and disparities in lung health. He writes about the policy, politics, and history of health care. He is the immediate past president of Physicians for a National Health Program, a non-profit organization that advocates for Medicare-for-All healthcare reform. He is on twitter @awgaffney.