Mars Helicopter, Harriet Tubman, Library Fines

The NASA rover Perseverance, and its attached mini helicopter, made it to Mars. Also, the extraordinary life of Harriet Tubman. Then, what happens when libraries remove book fines. Additionally on today's show: deciphering scrolls carbonized when Mount Vesuvius erupted, the life of a movie prop master, and the invasion of North American forest by none other than earthworms.