City of fun, clever language games is worth visiting.
Great academic videos with math practice for skills mastery.
Free quiz site is simple but effective -- and customizable.
Fun investigations are science-related; not very scientific.
Storehouse of data answers kids' questions -- if specific.
Learn physics while designing your own roller coaster.
Have fun with anatomy using 3-D images, interactive tools.
YouTube-like site for kids is good for play and discovery.
Animated educational content for kids to explore, for a fee.
Experiment-packed site with some seriously fun science info.
Social site with good edu value needs supervision.
Bulldozers, dump trucks, excavators. Kids will dig it.