Sara Chodosh and Claire Maldarelli

People living in counties with significant levels of COVID transmission, which amounts to two-thirds of all US counties, should resume masking.

Evidence was shaky at first, but as evidence from clinical trials has come in, the data are pretty clear on how effective the drug really is.

The evidence has been changing, but we know a lot more now than we did a few months ago.

Building them, tearing them, repairing them, eating them.

The desire to be thin can turn trendy diets into lethal weapons.