kids stuff
Here are some useful things for kids.
The Kid Should See This - great videos for kids from around the web.
Bird Call Hero - learn how to recognize bird songs.
Free Rice - learning games where you can earn money for the poor.
Encyclopedia Brown - I put together the answers to all of his mysteries, so you can make sure your kids have all the knowledge they need to solve them.
Dragonbox - a very cool app that secretly teaches algebra to your kids
Linguistics - the North American Computational Linguistics Olympiad has cool language puzzles to solve