Our minds can conjure up incredible daydreams, fond memories and extended reveries, and studies show that this kind of thinking for pleasure is good for us.
"If we're not the only species, we're one of the very few species that has these kinds of internal extended lines of thought, not just about things that have happened or things that might happen, but also things that will never happen, or that could have happened," said Erin Westgate, a social psychologist at the University of Florida.