Does the coronavirus-killing power of sunlight make it safe to go to the beach?

President Donald Trump has alleged that warmer weather could help slow the spread of the coronavirus, and a top official at the Department of Homeland Security repeated that claim this week. But many experts say there’s little evidence that hot, sunny days actually make beaches safer. Although sunlight can help kill coronaviruses on surfaces, it doesn’t work fast enough to help beachgoers, …