Demos by PIRA

  5E50.10Thermocouple and thermopile, both make electricity from heat.
  5E50.30Thermocouple magnet: Flame with ice bath, holds weight.
  5E50.30Thermocouple magnet: Flame with water cooling holds weight.
  5E50.60Peltier junction: Forward current freezes water drop, reverse boils.
  5E50.60Thermoelectric fan: Fan runs off of hot and cold water.