How well can you ever really know the people around you? This hour of Radiolab: a disorder that turns family members into impostors, and a scientific take on newborns that challenges Jad's warm fuzzies.

This hour of Radiolab: fighting the inevitable march of time. We meet a scientist and his particle accelerator, an artist, and a whole cast of characters in the Mojave Desert, where geologic time flows like a frozen hourglass.

The "mind" and "self" were formerly the domain of philosophers and priests. But in this hour of Radiolab, neurologists lead the charge. We  reflect on the illusion of selfhood, contemplate the evolution of consciousness, and meet a woman who one day woke up as a completely different person.

Under high gravity forces, fighter pilots often lose consciousness while flying jet planes. This hour of Radiolab, examining the connection between your brain and your body...and what happens when it breaks.