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 ...

In 1991 a group of enthusiastic dreamers built what would become known as Biosphere 2, a massive internalized ecosystem meant to emulate Earth's atmosphere, in an attempt to study what it would be ...