It is possible that a scientific discovery will be made that humans will later regret because it has awful consequences. The problem is, we probably would not know in advance and, once the discovery is made, it cannot be undiscovered.
“I am perhaps the oldest musician in the world. I am an old man but in many senses a very young man. And this is what I want you to be, young, young all your life, and to say things to the world that are true.”
“Long after this wonderful event in the Earth's history, when the human species was spread over a good deal of Asia, Europe, and Africa, migration to the American continents began in attempts to find new feeding grounds and unoccupied areas for hunting and fishing.”