Proof that everything is possible

For example, the ancients were aware of the conditions needed to make fire and how to put it out. They learned how to grow food by observing how crops responded to the seasons and so on. Early humans had a rudimentary understanding of what might be possible. They achieved this with varying degrees of success by observing nature’s regularities. However, they lacked an appreciation of what was behind the observed regularities. A deeper understanding would come about later.