We know we have a lot of sports fans reading this: Chicago has been the home of numerous great teams in all types of sports. But the winter weather in Chicagoland poses some serious problems for spots that have to play outdoors during the coldest part of the year. When temperatures drop and people are watching baseball or football (and if they’re lucky, get to see their team in the playoffs), they may not realize that many of these stadiums deal with the chill in the ground with something called field heating systems. These specialized installations help with snowmelt as well as make the ground softer to reduce the impact on athlete’s joints. (If you’ve ever jogged across a frozen field, you’ll know how much impact ice-cold ground has on your knees!)