1. "Animal Minds"

In this hour of Radiolab, stories of cross-species communication.

When we gaze into the eyes of a wild animal, or even a beloved pet, can we ever really know what they might be thinking? Is it naive to assume they're experiencing something close to human emotions? Or is it ridiculous to assume that they AREN'T feeling something like that? We get the story of a rescued whale that may have found a way to say thanks, ask whether dogs feel guilt, and wonder if a successful predator may have fallen in love with a photographer.




2. "Lucy"

Chimps. Bonobos. Humans. We're all great apes, but that doesn’t mean we’re one happy family. This hour of Radiolab: stories of trying to live together.

Is this kind of cross-species co-habitation an utterly stupid idea? Or might it be our one last hope as more and more humans fill up the planet? A chimp named Lucy teaches us the ups and downs of growing up human, and a visit to The Great Ape Trust in Des Moines, Iowa highlights some of the basics of bonobo culture (be careful, they bite).




3. "Limits"

On this hour of Radiolab: a journey to the edge of human limits.

How much can you jam into a human brain? How far can you push yourself past feelings of exhaustion? We test physical endurance with a bike race that makes the Tour de France look like child’s play, and mental capacity with a mind-stretching memory competition. And we ask if robots--for better or worse--may be forging beyond the limits of human understanding.




4. "Famous Tumors"

In this hour of Radiolab: an unflinching look at the good, bad, and ugly side of tumors.

Say hello to the growth that killed Ulysses S. Grant, meet Tasmanian Devils battling contagious tumors, and get to know the woman whose cancer cells changed modern medicine.




5. "Who Are You?"

This hour of Radiolab centers around a chilling question: how well can you ever really know the people around you?

We talk to neuroscientists, primatologists, actors, zookeepers, and fathers who are all trying to get inside another’s mind--from how a newborn sees his dad, to a rare disorder that turns family members into impostors.