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Michael J. Fox speaks to a crowd during a panel discussion about "Back to the Future" during the Silicon Valley Comic Con in San Jose, California on March 19, 2016.
The comic and entertainment-themed event features exhibits, panel discussions and pop culture artistry. Fox starred in the 1985 US science-fiction adventure comedy film "Back to the Future." / AFP / JOSH EDELSON (Photo credit should read JOSH EDELSON/AFP via Getty Images)