This week's episode comes to us from our friends at Radiolab! Close your eyes and imagine a red apple. What do you see? Turns out there’s a whole spectrum of answers to that question, and producer Sindhu Gnanasambandan is on one far end. In this episode, she explores what it means to see — and not see — in your mind.

We hear about fiber as the main ingredient for a good poo. But we’re starting to hear that it’s much more than that! Fiber is being hailed as a powerhouse nutrient, from powering up your gut and boosting your mental health to even helping with weight loss. So, does fiber really live up to the hype? We dive into the science with microbiologist Dr. Deirdre Mikkelsen, neuroscientist Prof. John Cryan, ...

About 40 percent of Americans believe in ghosts, and one in five even say they've had an encounter with one! So could ghosts really exist?? Or does some other spooky phenomenon explain these strange and sometimes terrifying experiences? To find out, we visit a haunted house with paranormal investigators, explore one very creepy basement searching for ghostly mold, and try to move cutlery with the h...