Dave Davies

The machines have long been used in manufacturing, but Martin Ford, author of Rise of the Robots, says they're now poised to replace humans as teachers, lawyers and even journalists.

Reporter Gregory Johnsen talks with Fresh Air's Dave Davies about the humanitarian crisis in Yemen and how the chaos is impacting the U.S. fight against al-Qaida. Johnsen describes a country torn apart.

Brooke Borel's new book describes their history and how they hide, bite and reproduce. Borel, who has combated them herself, says an infestation "does mess with your mind a little bit."