In 1965 Stanley Kubrick and Arthur C. Clarke discussed a film project, then called Journey Beyond the Stars. “Science-fiction films have always meant monsters or sex, so we have tried to find another term,” said Clarke. “The best we’ve been able to come up with is a space odyssey,” added Kubrick. “The far-flung islands Homer’s wonderful characters visited were no less remote to them than the planets our spacemen will soon be landing on are to us.”

In the Arabian Nights, Shahrazad tells of a merman who guides a fisherman around the ocean floor, where underwater societies shun clothing, commerce, and religious restrictions. “I have seen enough,” the fisherman says after eighty days, “for I am getting tired of eating fish.”

Before Sally Ride spent a week aboard the Challenger shuttle in 1983 and became the first American woman in space, NASA engineers asked her if she wanted a hundred tampons in her flight kit. “No,” she later recalled responding, “that would not be the right number.” They said they wanted to be safe. “Well,” she assured them, “you can cut that in half with no problem at all.”

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.