The Invisible Health Risk in Every AC Building

I walk out of my AC lab six times a day. The lab sits at 18°C. Chennai outside is 37°C. That's a 19-degree jump and my body absorbs it in the ten seconds it takes to reach the parking lot. By evening, I'm tired. Sometimes I have a headache. Sometimes my throat feels scratchy. I used to blame it on sleep, or the hostel food, or just "college...