In New York, a rat czar and new methods have brought down complaints. We may even be ready to appreciate the creatures.

The risk of nuclear war has only grown, yet the public and government officials are increasingly cavalier. Some experts are trying to change that.

R.F.K., Jr., and the MAHA movement are at war with synthetic food dyes. Scientists are racing to reinvent the culinary color wheel.

It’s clear that we’re on the precipice of a surge in preventable diseases. But how bad will it get?