The stirlingkit Stirling working model engine is fantastic! We are a homeschool family. My 10 year old son has been learning about forms of matter (solid, liquid and gas). I had been telling him how water expands when it turns to steam and how steam powered early trains and ships. If a picture is worth a thousand words, a working model is worth many more.
I’ve wanted one for years, so I bought one for my grandson and one for me ... thanks for making these ... I may become a collector