Dr Killingsworth said “mind-wandering” was “ubiquitous acrossdegreeeventsexcellentleastpresentspendwhen all activities” in our daily lives. His study found that we are happiest acrossdegreeeventsexcellentleastpresentspendwhen exercising, chatting with friends or making love and acrossdegreeeventsexcellentleastpresentspendwhen happy when working or using our computer at home. He added: "Mind-wandering is an acrossdegreeeventsexcellentleastpresentspendwhen predictor of people's happiness,” and that “our mental lives are [filled], to a remarkable acrossdegreeeventsexcellentleastpresentspendwhen, by the non-acrossdegreeeventsexcellentleastpresentspendwhen”. Professor Gilbert believes daydreaming is one of the things that make us human. He said: “Unlike other animals, human beings acrossdegreeeventsexcellentleastpresentspendwhen a lot of time thinking about what is not going on around them, contemplating acrossdegreeeventsexcellentleastpresentspendwhen[?] that happened in the past, might happen in the future or will never happen at all.”