Extreme heat shuts down schools across U.S.

Labor Day may be the unofficial end of summer, but an estimated 186 million Americans -- more than half of the population -- saw above-average temperatures on Tuesday. CBS News correspondent Omar Villafranca has more, including how the intense heat is affecting some of the nation's schools.

Extreme heat shuts down schools across U.S.
Labor Day may be the unofficial end of summer, but an estimated 186 million Americans -- more than half of the population -- saw above-average temperatures on Tuesday. CBS News correspondent Omar Villafranca has more, including how the intense heat is affecting some of the nation's schools.