Guests: Michio Kaku

Physicist and futurist MICHIO KAKU theorizes that humans living in outer space could eventually become a reality not just the stuff of science fiction.  Whether due to climate change or catastrophic cosmic events, it’s possible that our species might one day be forced to evacuate planet Earth and live among the stars.  In his new book The Future of Humanity, Kaku explores how developments in robotics, nanotechnology and biotechnology could enable us to someday build habitable cities on Mars.  He joins Marty for the hour to enlighten us about how humans might survive in the future.