It's on the farm of Gunnar Ingvarsson, the 74-year-old who decided 20 years ago to tap the boiling hot water spewing out of the ground.

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One study showed patients could put their hands into boiling hot water without registering pain after being hypnotised, when they had earlier experienced intense pain.

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R134a has a relatively low boiling point, the water is hot enough to convert it into a gas.

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The manti were filled with piping hot steam (and steam can be hotter than boiling water).

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