Going on a run and curious about how muggy it's going to be out? Maddie Sofia chats with producer Thomas Lu about relative humidity and why some meteorologists are telling us to pay more attention to dew point temperature, not relative humidity. Plus — how moisture in the air and temperature influence the way our body "feels" when we're outside. Click here for the National Weather Service Heat Index chart referenced in the episode.Follow Maddie on Twitter @maddie_sofia and Thomas @thomasuylu. You can email Short Wave at ShortWave@NPR.org.