Cool, free interactive textbook teaches design in 3-D.
Uneven mini-games let kids grapple with mechanics concepts.
Interactive textbook lets kids get hands on with concepts.
Kids learn, share, and build skills on excellent social app.
Dynamic, highly visual resource makes exploring words fun.
Beautiful astronomy resource is rich with information.
Mobile planetarium brings night sky up close, beautifully.
Impressive tool for stargazing, learning about astronomy.