Oh, there are many neato things about rocket stoves. Efficient burning; the heating of a cob bench ( that makes you feel so good ); the sculptural shapes. Nothing so far as amazing as this… Your tea doesn’t get cold!

I’m a fan of tea. Seems like you have to drink it while it’s warm and there’s only a short window of time where it’s at the perfect temperature. Not on top of the rocket stove.
I boiled the water in a tea kettle, poured it in the cup and left the cup on top of the stove and every time - Mmmmm warm. Progressively warm tea. What a joy!