These solar water boilers were literally everywhere in Tibet. The intensity of the sun in this phot gives you an idea of why these are such handy devices. The idea is to adjust the position of the kettle until the shiny metal back-panel focuses an intense ray of light onto the bottom of the kettle. It was amazing how fast these work, and how roiling hot they are actually able to get a whole kettle of water. Whether waiting for ramen noodles or hot tea this was the device folks were counting on throughout the country.
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