If nothing else, Roderick Davidson stirred the hopes of at least some of the Confederate troops defending Richmond in late 1864 and early 1865 with his "Artis Avis," a flying machine he believed could save the South.

Chimani continues to grow its library of national park apps for iPhones and Droids.

Interior Secretary Ken Salazar is calling on Congress to create a national historical park commemorating the work of the Manhattan Project, the top-secret effort during World War II to create an atomic bomb.

"The Narrows," that long, sinuous canyon the Virgin River long ago carved through the landscape now known as Zion National Park is back open to visitor use after a long, wet spring.