you're going to have these drones, you know, with humans in them, and they're going to bump into each other. there will be traffic in the sky just like there is here, except it's dangerous because if somebody bumps into the other, they're going to crash and die. >> agreed there's an issue about how to deconflict flying vehicles if all of us use them every day to and from work. but there's much more space in the sky than on the ground, and having worked on self-driving cars, i can tell you there's lots of stuff you can do on the ground that doesn't exist in the air. on the ground, say you have two rounds and they're at a right angle, and people drive this way and drive this way. to deconflict cars, we put in things like stop signs and traffic lights to make sure we don't bump into them. in the air, you let these guys go 100 feet higher than these guys. all of a sudden, they can just fly both at the direction they wish. by having the altitude, you get so much more space that the deconflicting issue becomes much easier in the air than on the ground.