Ken Jacuzzi was 2 years old when he was diagnosed with juvenile rheumatoid arthritis, a painful condition that can erode bones and deform joints.

His rheumatologist recommended soaking in a stainless steel hydrotherapy tank to cope with the pain. This brought the little boy temporary relief and inspired Jacuzzi's father, Candido, an Italian immigrant and inventor, to develop a similar application to use in the home bathtub.

Thanks to hydrotherapy, Jacuzzi lived to be 75 years old.

And to think, doctors said he wouldn't live past 3.

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