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A sense of direction: Finding your way without GPS
CBSN
By CBS News chief medical correspondent Dr. Jon LaPook.
There's one thing all animals have in common: a sense of direction. And while other animals may navigate better than we humans, most humans navigate better than I do.More Related News

It's an evocative idea that has long bedeviled scientists: a huge and mysterious planet is lurking in the darkness at the edge of our solar system, evading all our efforts to spot it. Some astronomers say the strange, clustered orbits of icy rocks beyond Neptune indicate that something big is out there, which they have dubbed "Planet Nine."