HA HA! As I was waiting for this to get fixed, I started re-listening to all the episodes starting with episode one. I probably never would have caught it but I had already seen Judas's comment so it stuck out to me. In episode 8 on Meteor Showers, Pamela was discussing why dust motes generate so much light when they hit the atmosphere. In her explanation she mentioned that even a potato could power NYC if its mass were converted directly to energy.

Edit: Now that I heard the new questions show she also mention's the potato thing trying to explain E=MC2. Its cool to see that most of these explanations aren't off the cuff but their own well thought out explanations used over a lifetime.