Inspiring bio of brilliant NASA mathematician in the 1960s.
By Suzanne Slade
Our planet tells its own history in fun, kid-friendly way.
By Stacy McAnulty
Condensed telling of movie misses some of the magic.
By Kim Smith
Beautifully illustrated book introduces kids to Carl Sagan.
By Stephanie Roth Sisson
Clever sequel gets tweens to think about how they're taught.
By Tom Angleberger