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Lumifer comments on Open Thread, Dec. 28 - Jan. 3, 2016 - Less Wrong Discussion
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While US politicians advocate building a wall on the border with Mexico, startups develop hoverbikes. In a few years all border walls might be obsolate because it's easy for everybody who wants to fly over them.
All sorts of other situations where walls or height is used to prevent certain area's to be inaccessible by human will also be affected.
US - Canada border is unguarded. If you avoid roads, you can just walk over it, no hoverbike necessary. And yet, it doesn't strike me as "obsolete".
I used to think that the US-Canada border doesn't have much effects in terms of goods or people flowing through it. Do you think the reality is different.
What do you mean by "much effects"? I can assure you border checkpoints exist :-)