Back in the old days, if your species was faced with an existential threat, you were stuck hoping for some advantageous mutation. Maybe an extra fin or a slightly more sophisticated eyeball. Outwitting fate was pretty much out of the question.  And as much as we might prefer to just go binge-watch something and forget about it, there are several plausible scenarios whereby humanity could face extinction in the too-close-for-comfort future.  Happily, thanks to our very large brains and thinkers like my guest today, theoretical physicist Dr. Michio Kaku, we have options. Dr. Kaku’s latest book is The Future of Humanity: Terraforming Mars, Interstellar Travel, Immortality, and Our Destiny Beyond Earth.  Surprise conversation-starter clips in this episode:  Brett Weinstein on the Social Brain (we watched only a portion of the clip), Daniel Bergner on Female Desire  Learn more about your ad choices. Visit podcastchoices.com/adchoices