Operations Safety Specialist Daniel Rennaker, U.S. Army Corps of Engineers Nashville District, seeks volunteers for a demonstration that shows how hard hats can protect someone’s head during a Tennessee STEAM Festival event Sept. 5, 2024, at Antioch Middle School in Antioch, Tennessee. He used a melon inside a hard hat to show demonstrate how it can be protected even when struck with a hammer. (USACE Photo by Lee Roberts)