GLADSTONE, Mo. – As Mike Costelow started up the hot tub in the backyard of his home, his voice was quickly drowned out by the noise. “It does still work, but the bearings are going out,” said ...

For many centuries we have bathed in communal waters. Sometimes for cleanliness but more often for pleasure. Indeed, in ancient Greece, baths were taken in freshwater, or sometimes the sea — which was ...