Peabody's Improbable History features a talking dog genius named Mister Peabody who has a pet boy named Sherman. Peabody and Sherman use Peabody's " WABAC machine" (pronounced "way-back", spelled WAYBAC in season 1, episode 4, and partially a play on names of early computers such as UNIVAC and ENIAC to go back in time to discover the realstory behind historical events, and in many cases, intervene with uncooperative historical figures to ensure that events actually transpire as history has recorded. The term "Wayback Machine" is used to this day in Internet applications such as Wikipedia and the InternetArchive to refer to the ability to see or revert to older content. These segments are famous for including a pun at the end. For example, when going back to the time of Pancho Villa, they show Pancho a photo of a woman and hepromptly gets the urge to take a nap. When Sherman asks why this is so, Peabody says that the woman's name is Esther, and whenever you "see Esther" (siesta) you fall asleep.