By RYAN KNELLER| THE MORNING CALL | JUL 20, 2019 | 5:30 AM Let’s all take a moment to thank Willis Carrier, the New York engineer who designed the first modern air-conditioning system in 1902. It’s not clear who made the first batch of ice cream — several food historians trace the chilled confection’s origins to around 500 B.C. in Persia, but I think most of us could sing that inventor’s praises as well in the midst of the Lehigh Valley’s latest heat wave. (READ MORE)