The Earth formed over 4.6 billion years ago out of a mixture of dust and gas around the young sun. It grew larger thanks to countless collisions between dust particles, asteroids, and other growing ...

A trek on the Cactus Forest Trail at Saguaro National Park east of Tucson offers spectacular views of the Sonoran Desert and something else: a glimpse into Tucson’s industrious past. Tucked into ...

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