Chris Hemsworth has told Sky News that finding out he had a greater chance of developing Alzheimer's disease was a "gear shift" in his life motivations. During a genetic test in season one of Limitless: Live Better Now, the Australian actor discovered that he is, biologically, eight to 10 times more likely than others to have the brain disorder during his lifetime as he carries two copies of the APOE4 gene. Hemsworth said: "It was just kind of this point in my life where up until your 40s, you'