 By this point in his life, Twain was, as Tesla described, in the worst shape, suffering from a variety of distressing and dangerous ailments. Thus, on this particular afternoon, Tesla suggested that Twain try out a new invention he'd been working on, a mechanical oscillator which sent vibrations through the body at various frequencies. Twain agreed and stepped onto Tesla's machine. At the end of the process, Twain suddenly leapt up and rushed to the toilet with terrible diarrhea. Despite this, Twain would continue to use the machine daily for almost two months, at the end of which he had, in the words of Tesla, regained his old vigor and ability of enjoying life to the fullest extent.