IMAGINE, IF YOU CAN, being conscious of only one moment—right now. This moment exists without a past or a future. Now imagine life being a series of these moments, each existing in some kind of isolation from all other moments, not connected by subjective time. Imagine being temporarily frozen in each of the moments that together make up normal living. It is hard to imagine this scenario because our minds travel back and forth through time so fluidly, like a ballerina in The Nutcracker. One moment serves as the grist for the next...