Inside Biosphere 2's giant glass pyramid, tropical trees stretch 80 feet above the forest floor. Crazy ants, so named because of their erratic movements, scurry below.

Inside Biosphere 2's giant glass pyramid, tropical trees stretch 80 feet above the forest floor. Crazy ants, so named because of their erratic movements, scurry below.

Paper beats rock and plants eat rocks. Biosphere 2 will show how plants can eat rocks at a lecture on Saturday. A discussion of the relationship between plants and rocks serving as a source for ...

Biosphere 2 lives on as a successful research site 30 years after eight people emerged from the experiment in the Arizona desert. (AP Photo/Ross D. Franklin) ...

In early October, Biosphere 2 will receive endangered Quitobaquito pupfish to introduce into its habitat. The fish hail from Arizona's Quitobaquito Springs by the U.S.-Mexico border, where water ...

Inside Biosphere 2's giant glass pyramid, tropical trees stretch 80 feet above the forest floor. Crazy ants, so named because of their erratic movements, scurry below.

Inside Biosphere 2's giant glass pyramid, tropical trees stretch 80 feet above the forest floor. Crazy ants, so named because of their erratic movements, scurry below.