3 ms·I think this is true if the prototype is known to be possible. It's not in the case.by leesec 7y agoI think this is true if the prototype is known to be possible. It's not in the case.winsome 7y agoWhat do you mean it's not known to be possible in this case?leesec 7y agoI mean their trying to build something no ones ever built before and may be currently impossible.