Evil Mad Scientist has a great collection of photos taken of the booklets that came with the sort of old-fashioned, you'll-put-your-eye-out chemistry sets regularly sold to children in midcentury America.
It's a treasure trove, not only for those of us interested in science, but also for anyone with a special place in their heart for the era's graphic design.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.