Sustainability scholar, mechanical engineer, community-based designer, Pioneer Valley native, and Vermont school-goer Rachel Koh is our guest. Koh knows things. They co-host Chart Toppers too. It’s all a rich tapestry. We deviate slightly with a first/last/best concert question instead of 10/20/30, but praise be there is no deviation from the renowned quiz. Those new to the show can follow us on twitter @somelaterdate. Those long-time listeners who haven’t can rate the show at iTunes. With thanks to Ben and Claire and credit to Chaka Kahn and Rubblebucket.