Understanding

We've seen them in sci-fi movies such as Men In Black. But do they really exist in real life without us knowing about it?

We've seen them in sci-fi movies such as Men In Black. But do they really exist in real life without us knowing about it?

The human mind is a complex instrument that often employs the game of odds to guide it in decision-making. Discover how this process works and what beating the odds means in situations from winning the lottery to being struck by lightning.

Chase tornadoes with the Oklahoma-based VORTEX Project and visit the NOAA's Space Environment Center to examine the solar cycles and meteorological currents that spawn the Gulf Stream, El Niño and the crucial North Atlantic Oscillation.

Scientists span the globe to assess global warming's effect on the world's ice and implications for the entire planet. Cryobiologists study animals that survive freezing temperatures and Olympian Kristi Yamaguchi discusses ice in our everyday world.

From the Petronas Towers in Malaysia to the John Hancock Center of Chicago, see how the world's tallest structures are designed to handle high winds, earthquakes and fire. Computer graphics illustrate their inner workings and points of vulnerability.

Most people think they can sleep enough to get by, but few realize it is regulated and required by the brain at any cost. Sleep patterns and habits can be modified and manipulated to better fit our needs, but sleep and wake are in a delicate balance.

Take a journey into the darkness, deep below the Earth's surface. Discover how caves were formed, learn who has walked their corridors through the ages, and see caves teeming with life that is amazingly different from our sunlit world above. Cities: Experts on subjects ranging from infrastructure to traffic flow explain what it takes to make a city run smoothly. Five cities are studied to see how they work and what gives them their personality.

Enter the extreme world of skydivers, big wave riders and wing walkers to discover what pushes these thrill-seekers to the limits of human endurance. Experience the adrenaline rush and learn the vital role this behavior plays in human culture.

Examine one of society's greatest frustrations, the gridlock that exists on the world's roadways. Since the invention of the automobile, car travel has become increasingly hazardous. Visit the world's most crowded cities in search of solutions. Narrator: Barry Corbin

The power, fragility and extraordinary qualities of memory are examined through the stories of an amnesia victim, a Vietnam veteran haunted by images of war and people tricked into altering their memories of critical events.

The brain's intricate organization is revealed through real-life stories of a teenager with an off-the-charts IQ and a child with half his brain removed to control seizures. Innovative medical tools, including 3-D imaging, track the brain in action.

Look twenty years into the future for a vision of a world where human beings live, work and play with intelligent computers and robots. Explore fears for the future as machines become more powerful, more present and more intrusive.

Examine the theory and scientific developments since Darwin. Explore the Galapagos Islands and the life forms that inspired Darwin's thinking. Hear the John Scopes controversy in Kansas where fundamentalist Christians want to abolish teaching evolution in schools; origin theories, Azee the orangutan, sexual selection, female boxer Bridgett Riley, and genetic engineering. Features interviews with science historian Richard Milner, author Jonathan Weiner, Celera Genomics president J. Craig Venter, evolutionary biologist Rob Shumaker, Pat Pratt, author Richard Dawkins, Los Alamos Labs scientist Bette Korber, USDA scientist Richard Beeman, evolution teaching opposer Linda Holloway and supporter Sue Gamble, Los Alamos Labs geophysicist and religious fundamentalist John Baumgardner, Swami Dheerananda, evolutionary psychologist Geoffrey Miller, author Michael Shermer (Skeptic), Professor of Biology Randy Thornhill, and Ward F. Odenwald.

The 21st century has been heralded as "the biotech century," but what does this mean? From Dolly the cloned sheep to DNA forensic work, genetic engineering has dramatic implications for society.

Money is the most powerful tool that Man has ever invented. It can build and destroy empires, and make people to go to war. Some people even believe that money is the key to happiness. What makes an object money? Where does it come from and who decides?

From subways to storage, tunnels occupy much of the infrastructure beneath our feet. Descend 1,700 feet below the mountains of northern Nevada to the most lucrative gold mine in North America and examine the world's largest railway tunnel system.

Laughing patterns, how the brain processes a joke, spontaneous laughter infects an African community, the art and craft of humor, faking a smile to reach euphoria. Features interviews by Paul E. McGhee and others.

Explore the universe of the ocean. Take the 1960 journey to the deepest part of the ocean, and meet a man who can hold his breath for four minutes while 500 feet underwater.

How do we get people into outer space? An astronaut describes her experiences, scientists explain rocket science, including propulsion, gravity and thrust, and engineers discuss the future of space travel. Astronauts Buzz Aldrin, Winston E. Scott, Story Musgrave, and Shannon Lucid talk about the excitement and wonder of space travel; actor/director Ron Howard explains how the crew simulated weightlessness in the film Apollo 13; science fiction authors Arthur C. Clarke and Charles Sheffield discuss the human longing to understand and explore the universe; and NASA administrator Daniel Goldin talks about the present and future of the U.S. space program.[

Television has become the dominant form of mass communication providing a source of immediate information and entertainment. Learn how it works and the tricks of the trade used to create programming.

The world, as we know it, is shaped by our senses. The biological processes that allow us to see, hear, smell, taste and touch are incredibly complex. Scientists examine our senses and medical breakthroughs relating to them. Features the artificial intelligence project, Cog, neuroscientist Vilayanur S. Ramachandran, photographer Howard Schatz, Stomp (dance troupe), and a perfume company.

Explore the strange, small world of quantum mechanics. The phenomenon of "uncertainty" takes a quizzical glimpse at quarks and a world in constant flux. In this episode, Leon Lederman makes a spoonerism: he says "swell foop" instead of "fell swoop".

iruses are the tiniest, simplest form of life on the planet. Yet they know ways to enter our body, kidnap our cells, and outwit our defenses

Join astronomers and astrophysicists as they probe light years beyond the Milky Way, in Understanding The Universe, part of Discovery's popular television series. Narrated by actress Candice Bergen, This enriching and entertaining video employs graphic models and spectacular computer animation to illustrate some of the most complex theories of all time. Peer through the largest telescopes on Earth. Get a close-up look at our sun, nebulas and supernovas, capture by the Hubble Space Telescope. Listen via satellite to echoes of the Big Bang. See how "red Shift" among the stars suggests that our universe if much younger than previously thought. Visit the set of Star Trek: Voyager and ponder the questions, could black holes be "worm holes," or shortcuts to other worlds? Understanding the Universe boldly goes where no television show has gone before.

Man has harnessed electrical power to light and fuel the world. Learn what electricity is, where it comes from, and how it works.

The desire to fly is as old as human culture. Ancient Egyptians studied birds in an attempt to learn how to fly. Centuries later, we were still strapping on wings, jumping off cliffs... and crashing. It took a bit of time, bruised bodies and the occasional death to figure out that we were too heavy and too weak to propel ourselves with flapping wings. But in the last century, our dreams of flight finally became reality. While we haven't grown wings, we have learned how to fly by shaping metal and plastic into machines that take us higher and faster than birds could ever fly or possibly even imagine. Produced and written by Pamela Caragol Narrated by Jane Curtin Photography by Chris Nusbaum Music by Michael Whalen

For centuries people have used fire to sustain life, to worship God, to annihilate enemies and to create technologies that run the world. Discover how both civilization and science was created from playing with fire.