A scholar in Peking contracted malaria in 1899 and was given medication with an ingredient labeled “dragon bones.” The bone chips, he found, were inscribed with writing dating back to China’s second dynasty. Thousands more were uncovered in the decades following; many of these “oracle bones” had inscriptions recording celestial events, which scientists have since used to calculate changes in the length of an earth day and in the rate of the earth’s rotation.

Students at the Federal Polytechnic Institute in Zurich wrote to Carl Jung in 1949 to ask what effect he thought technology had on the human psyche. “The danger lies not in technology,” Jung responded, “but in the possibilities awaiting discovery.” The question regarding new discoveries was “whether man is sufficiently equipped with reason to be able to resist the temptation to use them for destructive purposes.” This, Jung concluded, “experience alone can answer.”

The earliest reliable account of human flight concerns a Benedictine monk named Eilmer, who in 1066 fastened wings to his hands and feet, jumped from a tower, and glided more than six hundred feet before falling from the sky and breaking both his legs. He blamed the failure on not having fitted himself with a tail.

In his autobiographical novel Boyhood, Leo Tolstoy describes his youthful joy in philosophical abstraction: “I frequently imagined myself a great man, who was discovering new truths for the good of mankind, and I looked on all other mortals with a proud consciousness of my dignity.” His euphoria didn’t last. “Strange to say,” he wrote, “whenever I came in contact with these mortals, I grew timid.” Soon he was “ashamed of every simplest word and motion.”