For 30 years, scientists have been on the hunt for the source of the most powerful and mysterious explosions in the universe.

National Geographic takes you inside the hidden world of animal pregnancy in a way never before possible. Featuring state-of-the-art computer graphics and real-time, moving 4-D ultrasound imagery to see the unique world of animal fetal development.

The central character is a strange little dinosaur with wings on its legs as well as its arms. The pigeon-sized Microraptor is the smallest adult dinosaur ever found, perhaps the first known tree-dweller. But could it fly? A top team of paleontologists, aeronautical engineers, and paleo-artists reconstruct Microraptor and build a sophisticated model for a wind tunnel experiment. The results have surprising implications for long-accepted ideas about...

Discover the world's largest mountain and the highest peak in the world. "Everest, the death zone": In the wake of the 1996 disaster that took eight climbers in a single day, scientists follow a team of hikers to measure, for the first time ever, the toll high-altitude climbing takes on the heart, lungs, blood, and brain. "Everest, the mystery of Mallory and Irvine": The story of the early attempts on Mt. Everest and an exploration of the mystery...

Discover the latest thinking from solar enthusiasts and skeptics as it investigates these cutting-edge research developments. The program introduces viewers to the scientists and businesspeople who are racing to make solar power practical.