Blue text around a red question mark on a white background with an outer blue edge
"We never guess, we look it up!" was the slogan for World Book Encyclopedias. Salesmen from this company would give buttons with the slogan to prospective customers. For example, the company would send representatives to visit classrooms where they would have elementary students bring these buttons home to their parents.
Source: Scanning Around With Gene: When Knowledge Came from Books. (2008, December 05). Retrieved from https://creativepro.com/scanning-around-gene-when-knowledge-came-books/