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More than 125 million Americans were under the highest level of extreme heat alerts during a wave of above-average ...

The heat waves moving in recent days across Canada, the U.S. and northern Europe are part of a dangerous new climate pattern.

It can be found inside gas giants such as Jupiter and is briefly created during meteorite impacts or in laser fusion ...

When and where will the heat wane? Where does extreme heat remain? Large sections of the eastern half of the country still face a Level 4 out of 4 extreme heat risk, including sig ...