Health

Less than three weeks into the new Biden administration, Dr. Anthony Fauci, the infectious disease expert who has headed up the National Institute of Allergy and Infectious Diseases since 1984, is encouraged by the new president's approach to the COVID-19 pandemic. Fauci has worked with seven presidents, from Ronald Reagan to Joe Biden. Much of his career has been devoted to researching viruses and the immune system.

Daniel Lieberman is a professor in the department of human evolutionary biology at Harvard. He says that the notion of "getting exercise" — movement just for movement's sake — is a relatively new phenomenon in human history. His new book is Exercised: Why Something We Never Evolved to Do Is Healthy and Rewarding.