Mark Kelly blasts off with new kids' book
07:12Retired astronaut Mark Kelly joins Morning Joe to discuss his new children's book 'Astrotwins: Project Blastoff,' which is based on his childhood with his twin brother Scott.
Retired astronaut Mark Kelly joins Morning Joe to discuss his new children's book 'Astrotwins: Project Blastoff,' which is based on his childhood with his twin brother Scott.