Another handy educational website. I'm starting to create a list in the sidebar here. Hopefully keeping them together like that will make it easier for me to find them again when the urgent need to occupy children in 'something remotely educational but not requiring mothers input' strikes.
This one comes with the added Feed the World impetus. "No, Gabriel, you HAVE to keep going! A starving person somewhere is depending on your correct identification of the artist who painted this masterpiece!" Whipcrackaway!