In Arizona, nature is diverse and dramatic. The state's Tonto Natural Bridge State Park is home to the world's largest natural travertine bridge, where visitors can hike and explore its unparalleled ...

A molecule so small it could fit on a Post-it note of genetic code has just pulled off something scientists have chased for ...

A giant impact on the early Earth could have brought the building blocks of RNA to our planet, which new research suggests could have quickly formed in the presence of compounds called borates. When ...

Scientists used a new technique to estimate the abundance of hydrogen in Earth’s core. - Tumeggy/Science Photo Library RF/Getty Images Picture all of Earth’s oceans, which cover about 70% of the ...

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