Teacher at Blackboard

DescriptionEnglish: Teacher pointing to blackboard, from a 1924 advertisement
SourceAdvertisement for Postum in The Delineator (https://archive.org/details/delineator104olou/page/n125/mode/2up)

The blackboard has been made blank. In the advertisement, the original message was “ ‘Children should not drink tea or coffee at all’ —U.S. Bureau of Education.”

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