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At the beginning. We can used the Chinese story about a ruler throwing people off a cliff to their deaths. He wasn't trying get them to fly. He was just trying to execute them there was plenty of evidence that they wouldn't fly. That is until one did one person did. Based on that story there was no evidence that a human could fly using a kite before that point which is supposed to be the historical reference of when the. Everything before that point about kites are best guesses assumptions and beliefs. Which makes it difficult to verify or check assumptions, theories and beliefs.At what point in human flight was something designed that wasn't supported by any prior evidence?