I bought an inexpensive older set of encylopedias last year on ebay, to help with homeschooling. They've been a great help, quicker to look things up in, sometimes, than the internet. Lately, though, they've been the material of choice for building. Right now, they are a race track for Hot Wheels cars. I tried 4 times to share a picture, but blogger won't let me. Annoying.