@pjheinz
Just limit yourself to inform (It is much less stressful), as soon as you try to educate someone over Internet, you'll find yourself trying to climb barefooted and with no hands a 50 meter cliff.

The power of youtube videos is strong, almost as powerful as the power of ignorance.

Indeed, the Sterling engines require a temperature "difference" (not precisely heat, you can make it work by cooling a part).

This tells you something, the poor folk did't make it to your part that mentions heat as energy.

Great post, upvoted.