Biosphere 2 was touted as a new Noah’s Ark, a new Garden of Eden, a way to test how humans might colonize other worlds and study the effects of greenhouse gasses on Biosphere 1 — aka the Earth. Eight ...

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 ...

Thirty years ago last month, on Sept. 26, 1993, a group of eight weary, visionary adventurers “returned” to Earth after two years of living together in a miniature version of our world — a ...

Mark Nelson, one of the eight crew members locked in Biosphere 2 during its first closure experiment, will offer an insider’s view of the dramatic story behind the mini-world in two separate talks at ...