Oooh and ahh as America caps its 249th birthday with dazzling fireworks on the National Mall in D.C. If you don’t feel like jostling for the best viewing spots, your local PBS s ...

More than 10,000 years ago, a group of prehistoric humans stalked a 10-ton mammoth through moist grassland near what is now Naco. Then, in a bold move, the humans attacked ...