🔗 The Revenge of the Hot Water Bottle

Imagine a personal heating system that works indoors as well as outdoors, can be taken anywhere, requires little energy, and is independent of any infrastructure. It exists – and is hundreds of years old.
Reminds me I should use my yutanpo more. But truth be told, Sophie always sleeps by me feet, so I already have a Sophie-tanpo.
  1. Tagged with
  2. energy
  3. heating