Number 49: Tunnel visionWind tunnels have a long history at MIT, from helping understand why the windows fell out of the Hancock tower in downtown Boston to airplane testing. The first wind tunnel, built in 1896, was primitive it utilized MITs hot-air heating system. Subsequent tunnels were more sophisticated. The Wright Brothers Memorial Wind Tunnel was built in 1938 and used for industrial design and testing during World War II. It was later used to understand the aerodynamics of big buildings and entire cityscapes. The tunnels have helped us understand the aerodynamic aspects of Olympic ski gear, spacesuits, and subway station entrances.