New research showing that squirrels and chipmunks sometimes repeat the warning cries of birds.
The Future Of Copper Mining In Arizona
Copper mining has a deep connection to the history of Arizona. The so-called "Five Cs" that represented the biggest economic industries in the state included copper, but the current impact of copper could be called mixed.
It's in many things that we use every day, including computers and cars, but copper's environmental impact can be controversial.
Bill Carter, the author of "Boom, Bust, Boom: A Story About Copper, The Metal That Rules The World," joined us.