Alumnus Josh Linn demonstrates the "Boiling hot, boiling cold" experiment at the Saint Louis Science Center, where he is senior educator of Center Stage. The liquid nitrogen, so cold that it boils, vaporizes dramatically when it comes in contact with boiling hot water. He conducts and explains experiments like these on live TV for KSDK (Channel 5) and KTVI (Fox2) science segments. (Photos by August Jennewein)

Josh Linn