For centuries, people have considered mathematics the purest form of knowledge — and our best bet for deciphering the universe's hidden order. Steve spoke with two people who love math: physicist James Gates and science writer Margaret Wertheim.

Eels are philosophically and scientifically slippery — they're still some of the most mysterious creatures on the planet. Journalist Patrik Svensson has been obsessed with them, and wound up writing a surprise bestseller — “The Book of Eels.”

In many parts of Detroit, there are blighted, abandoned patches of land. Instead of looking the other way, Timothy Paule and Nicole Lindsey started buying up vacant lots and building bee hives as an act of urban renewal.

A single empty yellow chair sits next to Heather Swan’s tall, buzzing beehive in her backyard in Madison, Wisconsin. Swan keeps it there to sit next to the bees — some 60,000 insects —and talk with them.