I recently saw an ad for biscoff and I was surprised that people would eat them randomly. The only time I ever eat biscoff is on a plane when the flight attendant gives me some. Don’t get me wrong I absolutely love them but I rarely think about it as something I can just go buy in a store. Seeing the ad was so jarring because to me it doesn’t feel like something I should eat a lower altitudes
When browsing through used books, I try to guess which year the book was published based on typefaces, graphics, etc. and check with the copyright date on one of the front pages. For books published after ~1960, my guess is usually good to within 4 years.