Who Discovered Ganymede? Knowledge Cards

The fronts of these cards feature a story from the annals of science history with a question to ponder.  On the back you will find not just the answer, but more background as well.  Whether about the earliest explanations of rainbows or the sequencing of DNA, these cards will educate and delight!  From Archimedes to Einstein, test your knowledge of the history of science and discovery.