This PBS Explorer Collection includes: Mars: dead or alive (NOVA); Welcome to Mars (NOVA); Is there life on Mars? (NOVA); and Can we make it to Mars? (NOVA scienceNow).
How did the fierce wolf become a playful puppy? Why are there so many varieties of dogs? And how did they earn their place as "man's best friend"? This collection seeks to answer these questions-- and more.
This PBS Explorer Collection includes: Secrets of Stonehenge (NOVA); Riddles of the Sphinx (NOVA); Ghosts of Machu Picchu (NOVA); Secrets of the Parthenon (NOVA); and Secrets of Lost Empires II: Easter Island/China Bridge (NOVA).