Chris Hemsworth doesn’t give in to fear—or at least it seems that way. The action star spent his childhood adventuring around the Australian outback, and now, he even does some of his own stunts in his movies. He’s climbed the vertical surface of a dam, trained with elite military teams, and watched his kids take death-defying jumps on their dirt bikes, channeling any anxiety he might feel along the way into a little extra grit.

But true bravery lies in vulnerability and confronting our deepest fears, which are often more mental than anything else. Hemsworth is now leaning deep into that vulnerability, facing the fear that many people have of losing memory—their own, or that of their loved ones.

During the first season of his National Geographic docuseries, Limitless , Hemsworth le

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