One of their books that provided endless entertainment to me as a child came with a working stopwatch and provided prompts for random things to do against a tim

One of their books that provided endless entertainment to me as a child came with a working stopwatch and provided prompts for random things to do against a timer (how fast can you re-lace your shoelaces, do 10 jumping jacks and say the pledge of allegiance 5 times, draw a gorilla that somoene else can tell is a gorilla, etc) and compete against the records published in the book, or make up your own challenges. I found a used copy a couple weeks ago and sent it to some friends' kids in the mail. Their books felt honest and fun for children, not pandering, immature, or fake-educational.