Last week, Lauren Sommer talked with Short Wave about the dangerous combination of heat and humidity in the era of climate change and how the heat index can sometimes miss the mark in warning people how hot it will feel. That reminded us of producer Thomas Lu's conversation about relative humidity with Maddie Sofia. He digs into why some meteorologists say it's important to pay attention to dew point temperature and how moisture in the air and temperature influence the way our body "feels" when we're outside. (Encore)