The voice of the skeptic~

Even if we were capable of completely achieving the above, how would we ever know if it was a true bird? Where does flight really reside? We may build a functioning, flapping wing, but what if the essence of flight is deeper, hidden within the cells or elsewhere? We would only succeed in making a hollow doll that only gives the appearance of flight. If this is the end result, is it a worthwhile investment of our time and resources?
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