We, humans, like to think we'll be here forever, but the geological record shows that's unlikely. Earthquakes, rising seas, asteroids...all of these have the potential to put our entire species at risk. So does humanity need a contingency plan? Dr. Nandi raises the issue with Naveen Jain, whose company, Moon Express, is building machines to mine the moon for raw materials...and Professor Paul Van Susante of Michigan State, whose work with NASA involved looking at the nitty-gritty details of what it takes to send humans to other planets.