ADVANCE FOR SATURDAY DEC. 24, 2016 AND THEREAFTER - In this Dec. 13, 2016 photo, Pioneers Home resident Joe Nistler, 90, reacts to a virtual reality video of a herd of elephants walking while Lincoln Markham, right, watches in Fairbanks, Alaska. Lincoln Markham and Dan Markham are the father-son duo behind the extremely popular What's Inside YouTube channel. (Matt Buxton/Fairbanks Daily News-Miner via AP)
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