In a polarized world, what does ‘follow the science’ mean?

Should kids go back to school?

One South Korean contact-tracing study suggests that is a bad idea. In analyzing 5,706 COVID-19 patients and their 59,073 contacts, it concluded – albeit with a significant caveat – that 10- to 19-year-olds were the most contagious age group within their household.

A study out of Iceland, meanwhile, found that children under 10 are less likely to get infected and less likely than adults to become ill if they are infected. Coauthor Kári Stefánsson, who is CEO of a genetics company tracking the...