[jlogajan]

Anti-gravity devices are impossible under the laws of physics, specifically the First Law of Thermodynamics.

I would have to disagree with that. Attractive and repulsive forces are known in nature, obviously. But you just don't have a repulsive force appear out of nowhere and do work for you. You are required to insert energy or tap into a natural store of potential energy in order to make use of repulsive forces to do work, lifting, etc.

[Timesink]

I would have to disagree with that. Attractive and repulsive forces are known in nature, obviously. But you just don't have a repulsive force appear out of nowhere and do work for you. You are required to insert energy or tap into a natural store of potential energy in order to make use of repulsive forces to do work, lifting, etc.

Exactly. Which means it's not an "anti-gravity device" as most people think of them. Like I said, no different from planes or birds.