Scientists simulated what happens when the pipes and tunnels that divert rainwater fail. In one scenario, 30 percent of local residents couldn’t reach an E.R.

Cincinnati wants to take in people fleeing climate disasters. Plus, the latest on fires in Europe.

Encryption systems rely on “random” numbers, but conventional computers can’t generate them perfectly. New research shows that quantum physics can.

The claim that their loved ones’ deaths and disappearances are linked is almost certainly false — but the loss remains real.