The heat is on across the country. Learn how to stay cool -- and safe -- when the mercury rises.
Heat-related deaths and illness are preventable yet annually many people succumb to extreme heat.
Courtesy of NOAA/Institute for Exploration/University of Rhode Island
The last passenger pigeon dies, World War II begins, the Soviet Union shoots down a Korean airliner, and the wreck of the Titanic is discovered, all on this day.
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