Swedish kids are in general only allowed sweets on Saturdays which helps. That actually leads on to a pretty dark story too long to write in this margin, but Wi

Swedish kids are in general only allowed sweets on Saturdays which helps. That actually leads on to a pretty dark story too long to write in this margin, but Wikipedia has a good summary: https://en.wikipedia.org/wiki/Vipeholm_experiments https://en.wikipedia.org/wiki/Vipeholm_experiments