AQUARTER of a century ago next April, the late Prof. E. D. Cope, struck by the remarkable fact that the molar teeth, both upper and lower, of all the mammals from the Puerco or lowest Eocene horizon ...

The Phoenix City Council unanimously passed an updated heat response plan to include expanded cooling center hours and a heat awareness training program. Arizona renters could soon get new protections ...

When temperatures rise, this is the number to keep an eye on. By Jesus Jiménez When heat intensifies, all eyes are focused on the temperature. But often, experts say, it’s the heat index that should ...

Another hot summer is coming to the United States. Here’s how to be ready. By Adeel Hassan and Victor Mather Tens of millions of people across the Southwest and California are bracing for a heat wave ...

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