Episode Detail: Vacuums - Modern Marvels
A history of vacuum devices. Included: underwater vacuums designed to remove algae from coral reefs; huge vacuum cleaners used in the aftermath of natural disasters; pneumatic tubes used in the 19th century to deliver mail; vacuum-powered railways. Also: a visit to Hoover's Vacuum Cleaner Museum in Ohio; and the world's largest vacuum chamber at the NASA Glenn Research Center's Plum Brook Station.