3:52 minutes

Diana Nyad says salt water was one of her biggest challenges during her record-breaking swim from Cuba to Florida. As the body absorbs too much salt, it can cause swelling, sores, dehydration, vomiting, impaired judgment and hallucinations. To stay focused and alert, Diana says, she played certain mind games with herself. Watch to find out how the Beatles and physicist Stephen Hawking factored into it.

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