"Last week Why Are There Clouds? was one of the most popular posts on the Free Tech for Teachers Facebook page. A good follow-up to that lesson is found in Where Does the Smell of Rain Come From? Produced by It's Okay to Be Smart, Where Does the Smell of Rain Come From? explains why we sometimes think we smell rain before a thunderstorm. Through the video we also learn about the role of petrichor in the lives of some animals."