$12.95 from Edmund Scientifics - Kids create 50 amazing contraptions that spin, fling, collide, and whiz! All kinds of gizmos and gadgets that help them understand the laws behind motion, friction, gravity, rotation, balance, and energy.

$17.95 from National Geographic - He was crowned King of Egypt at about age nine and died abruptly and mysteriously at age 18. Featuring more than 60 photographs and illustrations, the book teaches children about the prominent people in King Tut's life.

$18.95 from National Geographic - Did all of the people who came to the Americas many thousands of years ago cross the Bering Land Bridge between Siberia and Alaska? Some early Americans did, but tantalizing evidence shows that many did not.

$17.95 from National Geographic - It's been 200 years since George Washington died, but his story is more important than ever. His sacrifices for his country made him a legend, but who was this complex and valiant man?

$16.95 from National Geographic - In this delightful brother-sister collaboration, the tiny guitar-making village of Paracho, Mexico comes vibrantly to life. Ages 9 - 12. Hardcover.

$24.95 from National Geographic - This updated edition of the award-winning classic features current population and economic information for the country as a whole, as well as for each of the 50 states, Washington, D.C., and the territories.

$22.36 from Barnes & Noble.com - Newt Gingrich, architect of the Contract with America, says it's time for citizens to demand results from our elected officials. In this exciting new book, he shows how America can achieve transformational change.

$19.95 from National Geographic - Like a true-life Indiana Jones, archaeologist Dr. Zahi Hawass has lived through countless adventures while exploring the tombs of ancient Egypt. Here, he recounts some of his most exciting exploits in astonishing detail.

$16.00 from National Geographic - The only full-color guide to Lewis and Clark's America, this updated and expanded bicentennial edition retraces the epic journey, linking historical events to present-day places. 192 pages; 75 photographs; 12 maps.

$17.95 from National Geographic - Learn about the long and vastly productive life of our third President - a brilliant, controversial man who made lasting contributions to science, education, architecture, philosophy, and government. Ages 8 and up.