Once you’re vaccinated for COVID, do you still need to wear a mask or keep your distance from others? Also, when elite colleges make the SAT or ACT optional for applicants, who wins? Then, what oil and gas companies knew decades ago–but never said publicly–about the dangers of air pollution. Also today: an alternative to leather made from silk, what neuroscience can tell us about near-death experiences, and the link between COVID-19 infections and pollen in the air.