Could you pick up, say, a manhole cover?
replySure, why not?
replyThe seal won't be perfect so you'll be running the pump more or less continuously. Apropos manhole covers: I wonder what would happen if this car would drive over one. Or was that your point?
This is not how it works. It’s not sucking against the road, it’s pushing against it with thrusters at the top of the car.
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