Tens of millions still under dangerous heat warnings. Go indoors and hydrate

PHOENIX (AP) — Extreme heat alerts continued for tens of millions of people in the United States on Tuesday as cities including Chicago broke records at the start of a week of sweltering weather.

States in the Midwest started to bake Monday in what the National Weather Service called a dangerous and long duration heat wave that was expected to stretch from Iowa to Maine into at least Friday.

On Monday, Chicago broke a 1957 temperature record with a high of 97 degrees Fahrenheit...