How to make a boring thing more boring.
D000375:Aging; D001288:Attention; D001887:Boredom; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D003071:Cognition; D005106:Exploratory Behavior; D006801:Humans; D007092:Imagination; D010988:Play and Playthings; D013663:Teaching; D014796:Visual Perception