Hmm, not sure about the security implications of many medium-sized flying vehicles, just forcing one to drop out of the sky in a crowded downtown would be prett

Hmm, not sure about the security implications of many medium-sized flying vehicles, just forcing one to drop out of the sky in a crowded downtown would be pretty nasty. So the TSA may be replaced with some other kind of inspection regime (or surface to air missiles). As for weekends on Mars, we'll need your solved graphene to build a space elevator to get into orbit cheaply, but the travel time will presumably be months, any faster and you'd be a pancake inside the craft, either accelerating or decelerating.