Do we have free will? Do we have a choice in what we do? Philosophers and theologians have debated these questions for centuries; Robert Sapolsky answered them when he was 14. Free will, he concluded, simply does not exist. Robert is now in his mid-sixties. He has degrees from Harvard and Rockefeller University; he won a MacArthur “genius” award; and he’s a professor at Stanford, where he holds joint appointments in biology, neurology, and neurosurgery. But despite how much time has passed and how long his CV has grown, he never lost his youthful fascination with free will — or our lack thereof — so he decided to write a book about it. It’s called “Determined,” and in addition to assembling a formidable case against free will, Robert makes the intriguing argument that if we can abandon our illusion of volition, we can build a more humane world. Support the show by becoming a Next Big Idea Club member. (Use code PODCAST for 20% off.) We’re hosting a live taping in New York City on January 31st. Come on by! We’d love to meet you. You can learn more here.

What makes us happy? Researchers at Harvard have been trying to solve that riddle for 85 years. Now, they think they’ve found the answer. Marc Schulz, associate director of the Harvard Study of Adult Development, joins to tell us more.