There's nothing like a fresh dose of oxygen. "House burping" might be a thing now, but opening up windows to let fresh air in has been encouraged for a while! In these archival posters from the 1940s, the BritishRedCross recommended that children sleep with their windows open for health benefits and play outside as much as possible. This was part of the organization's Junior Red Cross program, which started in 1924. The goal was to promote health and wellness among children and get them trained in first aid skills. #BritishHistory #MuseumsOfInstagram