Naked Science - Season 6 (2009)

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Follow a basic explanation of what a black hole is an how it forms, this program explores what happen near and even inside a black hole based on current theories of gravitation. The great lengths scientists have to got to to test the theories are described.

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Secret World of Fireworks explores the closely held secrets, recipes, and techniques from the world of pyrotechnic showmen. National Geographic takes a behind the scenes look into this exclusive world with unique access from Zambelli Internationale of New Castle, Pennsylvania - Americas First Family of Fireworks - along with rocket scientists and chemists from Los Alamos, New Mexico.

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Follow the minute-by-minute aftermath of a hypothetical dirty bomb attack in a small New England city.

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France's Lascaux region is home to the famous caves decorated with drawings by prehistoric man. Scientists and historians have long though they represented the simple concerns of the people of that time: hunting and gathering, for example. Now, some scientists believe the drawings represent much more than that; they believe they show an advanced knowledge of the night skies and of the stars which moved through the skies.