Ernie and Erica star in a 4-DVD series. The first DVD, "Fire Science", gives the background information needed for rocket stoves and rocket mass heaters. The second DVD is "Sneaky Heat" referring to rocket mass heaters. The third DVD, "Boom Squish" is about rocket hot water and the last DVD, "Hot Rocket" is about rocket stoves, fox stoves, pocket rockets, and a rocket forge. streaming version / physical DVDs