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Millions of years ago, Venus and Earth cut similar figures. Roughly the same size and about the same distance from the sun, their respective evolutions could have followed similar paths. But today, Venus is a seething vision of Hell, its battery-acid atmosphere and incessant, hurricane-force winds masking a blistering volcanic surface. Some scientists wonder if it is a harbinger of whats in store for Earth. Thanks to the European Space Agency, Venus Express the most sophisticated satellite ever to visit the planet is orbiting Earths estranged twin, gathering the data we need to figure out why Venus went bad. Could our home planet be hurtling towards a similar fate? And could the hostile Venusian environment, now seemingly devoid of biologys most fundamental ingredient water yet harbour life?

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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Stephen Hawking is one of the worlds most famous scientists. But ALS, also known as Lou Gehrigs Disease, has left him almost totally paralysedand it is progressing. Unable to walk, talk, or write, his only way of communicating is through a computer program that turns a small movement of a finger or the blink of an eye, into words from a vocal synthesizer. But Hawking remains determined to discover a theory of everything, a complete set of rules for the Universe. Where did the Universe come from and where is it going? What is the nature of time? Will it ever come to an end? This programme will explore Hawkings major contributions to the understanding of our Universe - from his revolutionary proof that our Universe originated in a Big Bang; to his ground breaking discovery that Black Holes are not completely black, but rather emit radiation and eventually evaporate and disappear, to his insights on string theory. Will he unlock the secret of creation before his time runs out?

Travel back in time to look at three of the largest mass extinctions that have decimated life on the planet. What caused these wipeouts?

Until recently, there was nothing that could be done about natural disasters like super-volcanic eruptions, meteors striking Earth, and severe hurricanes. Now, both science and government are looking at possible game-changing options that include giant space mirrors, hurricane-draining pumps and lasers to save people and the planet.

Dead Tired uncovers research exploring whether tiredness may lead to heart attack, diabetes, obesity, and depression. In a unique TV experiment, witness what happens to a healthy 25-year old when he cuts back his sleep from eight to three hours a night for one week. The results are shocking! He loses lucidity, dreams whilst awake and drives a car while fast asleep!