An Iowa man and his sons made a huge discovery on their Oskaloosa farm recently. Now scientists are in the process of excavating a mammoth skeleton. We’ll hear what they hope to learn from the find. Then, 18-year-old Rae Heim of Carroll is running barefoot across the country this year from Boston to Huntington Beach, CA. She has reached Iowa – raising money for an organization called souls4soles – a Christian organization which supplies shoes to needy kids. Rae talks with River to River's Ben Kieffer about her journey.