Imagine the year is 6965, and you’re about to open a time capsule buried since October 16, 1965. As a record of 20th century living, it was lowered deep within the earth on the last days of the famed 1964–1965 New York World’s Fair, with instructions to remain sealed for 5,000 years. In fact, this would be the second such time capsule, the first having been firmly planted on...