81-year-old body surfer Fred Wilkens can guess water temperature with crazy accuracy

Meet the Human Thermometer. After swimming in the ocean for 70 years, body surfer Fred Wilkens, aka "Zuma Fred," can guess the water temperature within a degree. The 81-year-old takes a dip in the Pacific every day, and even goes in without a wetsuit.

One of us can do this too. On the glass of a car while driving. Within 1/2 point.

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