A gyroscope, a radiometer, pentominoes, a lego bucket, a chess set? There are also the Handy _____ Answer Books. I see you've already included the Cartoon Gui

A gyroscope, a radiometer, pentominoes, a lego bucket, a chess set? There are also the Handy _____ Answer Books. I see you've already included the Cartoon Guides to ____, which are great. There's got to be a set of children's encyclopedias, but there is also the Internet [1]. [1] https://simple.wikipedia.org/wiki/Main_Page https://simple.wikipedia.org/wiki/Main_Page EDIT: I don't remember pentominoes being square, more triangular/rhombus shaped. Wikipedia shows unfamiliar shapes: https://en.wikipedia.org/wiki/Pentomino https://en.wikipedia.org/wiki/Pentomino