Plus, why we shouldn’t count on lockdowns to work again.
Fifty years of research suggests police behavior makes the biggest difference in how safe protests are for everyone. Plus, how tear gas ups COVID-19 risk.
Plus, understanding false negative results in COVID-19 tests and the sounds of elusive narwhals, captured on tape.
A handful of COVID-19 patients under the age of fifty have experienced strokes, raising questions about the virus.