lava lamps a the ultimate hand warmer
I found an old blue lava lame a while ago and found it very useful to warm hands. It's also really neat to find it in stasis in the cool morning to start moving as soon as any pressure is applied to the glass. I remembered how I made an Archimedes diver that would rise or fall when the glass bottle was squeezed and shows the flexibility of gass. The lava lamp seems to take on the personality of the squeezer...