In the early 20th century, terrapins–a kind of turtle–were a culinary delicacy. Then humans nearly hunted them to extinction. While Americans don’t eat much turtle these days, terrapin populations are still in danger–from crab traps. Randy Chambers is working to perfect a device for crab traps that will help protect terrapins. And: Learning about learning is a lot easier if you’ve got hands on practice. That’s what inspired the first ever Wise-minster Dog Show at the University of Virginia College at Wise. Robert Arrowood’s psychology of learning class put theory to practice by training shelter dogs. Through the project, UVA Wise students helped dozens of dogs find their forever homes.

Later in the show: Lab rats have a pretty cushy life. And if you measure their stress levels compared to wild city rats, it shows. But what about wild country rats? Molly Kent’s research asks questions about stress in rats, but along the way she’s learning about human stress, too. Plus: Are undiscovered animals lurking in plain sight? Tara Pelletier says that even if animals look the same to our human eyes, they can have genetic differences that make them different species.