A 21-year-old Florida man made history this weekend by becoming the first person with Down Syndrome to compete in and finish an Ironman triathlon.Guiness World Records recognized Chris Nikic’s achievement after he finished a 2.4-mile swim, a 112-mile bike ride and a 26.2-marathon run at the Ironman Florida competition in Panama City Beach.”Ironman. Goal set and achieve,” said Nikic in a post to Instagram. “Time