The Danny Dunn books were popular in the 50s-70s. I'm not sure if they are still in print, I found Danny Dunn on a Desert Island in the school library, chances are you'll find some too. The technology in them seems quaint today but that is part of their charm. This is just a short unit that I am putting up for free.....What!! I hear you say, FREE? Yes, why not. If you can find the book somewhere then give it a shot. My kids enjoyed it and had a lot of fun writing the journal and making the models.