If I tell you that I actually bought these books (the second one was fancied by my husband when we were in Costco, and who am I to decline when it is not always that he likes to read books?!):
What comes to mind? Looking at these titles, you’d know that I am into trivial matters, too 
So I am so giddy to have found a site with lots of trivia to share: Life’s Little Mysteries! Hop on to the site and you just might find a carefully researched and well-written answer to your question!