A gooey substance normally wouldn’t seem like it could stop a bullet, but an Air Force Academy cadet has created just that. Air Force Academy Cadet 1st Class Hayley Weir created a goo-like substance that can stop bullets. Cadet 1st Class Hayley Weir’s interest in bullet-stopping materials was piqued when she took a chemistry class at the academy in 2014. The class was given three materials to combine in a way that could stop a bullet. “Up to that point, it was the coolest thing I’d done as a cadet,” Weir, a senior at the academy, told Air Force Times....