chaos up there. you will have drones with humans in them and bump into each other and there will be traffic in the sky. it is dangerous because if somebody bumps into the other they wail crash and die. >> i agree there is an issue with -- all of us use them every day to and from work. there is more space in the sky and on the ground. i can tell you there is lots of stuff on the ground that does exist in the air. so the ground say you have two roads and they are right angle. and people drive this way and this way. we put in things like stop signs to make sure we don't -- in the air what you do is you let these guys go 100 feet higher. they can just fly at the direction they wish. by heading to the altitude you get so much more space that the deconflicting issue becomes much easier in the air than on the