Synopsis by Sean Hurley
This four-volume series from PBS Home Video explores the millions upon millions of unseen neighbors who share our homes and even our bodies: microbes. Scientists explain why we can't live without microbes even though they often make us sick. As the first life form on Earth, the microbe was -- and continues to be -- the basis of the Earth's food chain, in addition to being responsible for the production of the majority of our planet's oxygen. This series examines the accepted scientific notion that all life on Earth depends on these tiny creatures. In Intimate Strangers: Unseen Life on Earth, Vol. 2 -- Keepers of the Biosphere the program explores the critical interdependence of all parts of a system, which is central to the well-being of the whole. Using the failed experiment of the Biosphere as its example, scientists explain how the underestimation of the critical role of microbes brought down the project.