Mid-20th century U.S. Social History print showing a pair of hands and a toothbrush along with the caption 'Keep Clean' in an attempt to encourage people to embrace cleanliness and observe hygiene in their daily lives. The print was released as part of a social hygiene movement which gathered momentum during the early 20th century and continued throughout, finding its way into schools. Artwork by Erik Hans Krause, circa 1937. Vernon Lewis Gallery/Stocktrek Images