"A Utah man who bought a McDonald's hamburger for presentations on enzymes said the burger is now more than 20 years old -- and it appears unchanged. "David Whipple said he originally bought the hamburger July 7, 1999, at the McDonald's in Logan, Utah, to use in presentations on enzymes and deterioration. "Whipple said the burger ended up forgotten in a coat pocket for several years and it ended up with viral fame when he rediscovered it in 2013." Full monty at UPI: https://www.up