| http://www.w3.org/ns/prov#value | - And on that point, not everyone is optimistic.???The number one problem in the aeronautical sense, with VTOL, is you???re trying to have it all, and in aviation, everything is a tradeoff,??? says Roger Connor, curator at the Smithsonian???s Air and Space Museum in Washington DC. ???This is really, really hard to do, this is harder than rocket science in a lot of ways,??? says Connor. ???You???re t
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