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Aegean civilizations relied for centuries on charcoal and volcanic stones, which they obtained from volcanic eruptions that took place during their lifetimes, to keep their physical fitness and health in good shape and to prevent disease.  Finland's hot tubs are small wooden structures with no ventilation or openings that are used for bathing, despite the fact that it is technically a sauna in other countries.  In Finland, a hot tub is used for bathing.  It was impossible to see out of the original wooden house's windo... more