Much like the wheel, the boat, and the telephone, the axe is a transformative piece of technology―one that has been with us since prehistory. And just as early humans used the axe to chop down trees, hunt for food, and whittle tools, they also used it to murder. Over time, this particular use has endured: as the axe evolved over centuries to fit the needs of new agricultural, architectural, and social development, so have our lethal uses for it.

Rachel McCarthy James, who wrote "The Man From the Train" with her father Bill James, returns to the show to talk to share some of the history of this iconic tool and weapon. She shares examples of how it's been used for violence over the centuries - from the Vikings to Henry VIII to Lizzie Borden.

Her new book, out on May 13, called "Whack Job: A History of Axe Murder".

The author's website: http://rmccarthyjames.com/

The author's publisher page: https://us.macmillan.com/books/9781250276735/whackjob/

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