HENDERSONVILLE, Tenn. (Oct. 27, 2021)— Antioch Middle School teacher Thomas Yan toured the Old Hickory Lock and Dam, and the Old Hickory Hydropower Plant during the Middle Tennessee Science, Technology, Engineering, and Math Innovation Network Externship with the U.S. Army Corps of Engineers Nashville District on October 21-22 to learn what STEM job opportunities USACE has to offer future graduates.