When actor Chris Hemsworth, who played Thor in the Marvel series, agreed to join a documentary exploring longevity several years ago, he figured he would learn about how to live better so that he could live longer. But he never anticipated he would find out something that could dramatically affect what those future years could look like. In the documentary series Limitless , released in 2022 by National Geographic , Hemsworth took a battery of tests to learn what he could do to extend his