We have a sense of continuity, which gives us what we call a sense of time. Through our ability to have remembrances of both what's coming and what's happening and what has happened, we begin to piece together a logical picture of the world.
I started graduate school in 1971, I started working at the Smithsonian in the festival in 1972. I went full-time at the Smithsonian in 1974. And I got my doctorate in 1975.