But all these ideas are massively costly, demand security certification specifications for road and air, need twin controls, contain elaborate folding wings and propellers,and ought to be flown from air-strips.The persistent haze about lots of our metropolitan areas can be a reminder on the

But every one of these concepts are massively costly, require protection certification expectations for road and air, need twin controls, require complicated folding wings and propellers,and have to be flown from air-strips.The persistent haze around most of our metropolitan areas is a remin

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