National Geographic’s official YouTube channel and website occasionally unlock the first episode ("Genius: Einstein – Chapter One") for free. While this isn't the whole season, it allows you to test the waters before committing to a trial elsewhere.
Genius Season 1 consists of 10 episodes, each approximately 45 minutes long. Here's a brief summary of each episode: genius season 1 free
National Geographic’s (Season 1) explores the life of Albert Einstein, from his early years as a rebellious patent clerk to his status as a world-renowned physicist. genius season 1 free