Fun cartoons and audio engage tweens studying new words.
Beautiful astronomy resource is rich with information.
Mobile planetarium brings night sky up close, beautifully.
Impressive tool for stargazing, learning about astronomy.
Solid times tables practice and some tricks.
Interactive app best for tweens, teens interested in robots.
Terrific tool for learning speedy math tricks.
Excellent tutorials on math, humanities, and more, for free.
6 fun ways to practice; purchase needed to unlock full app.
Great graphics and interface make presidents come to life.
Learn mental math secrets that can boost performance.
Free practice tool is good but has incomplete word list.
Advanced quiz questions target true geography buffs.