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Modified and powerful street cars first appear in the 1930s, leading to the sport of drag racing with customized hot rods.

Auto racing spawns a new breed of sports cars for the elite.

Harley-Davidson motorcycles are first built in a Milwaukee garage in 1903, and in a few decades the machines become a troubled American icon.

The history of the iconic toy's journey and the brand's multi-generational influence on car culture and design.

Knight Rider star David Hasselhoff sets out to prove how the iconic '80s KITT car inspired and revolutionized the car industry for years to come.

From the unimaginable power of nuclear bombs to microscopic anthrax spores, we reveal who possesses these nightmare weapons and explore the danger posed by terrorists with deadly technologies.

Doomsday threats range from very real, nuclear arsenals, to controversial, global warming, to futuristic - nanotechnology, cyborgs, and robots.

We examine more threats--both natural and manmade--that may endanger civilization; from the far reaches of space to tiny viruses, doomsday sources are many.

Nuclear research ranges from well-known applications, such as bombs and reactors, to little-known uses in medicine, food preparation, and radiation detection. It's also spawned ancillary technologies to store nuclear waste and clean up accidents.

Nuclear submarines carry more firepower than all bombs dropped in history; since the 1950s, these steel vessels became U.S. defense cornerstones, sparking Cold War underwater competition and creating engineering miracles for deterrence.

Wartime research and development have revolutionized communication, transportation, and medicine; from Spam to nuclear power to hairspray and cell phones, life as we know it ironically owes a lot to war.

Tiny weapons may not sound impressive, but small can kill, and it can also be easily concealed; from a pocket pistol used by the police to a submachine gun wielded by a bodyguard, many of today's most effective weapons are smaller than ever.

On a proving ground, you can fire a missile without scaring the neighbors or lift millions of pounds in pursuit of ounces of gold. Performance is the only thing that matters, and no excuses can be given in battle or competition.

From the unimaginable power of nuclear bombs to microscopic anthrax spores, we reveal who possesses these nightmare weapons and explore the danger posed by terrorists with deadly technologies.

Doomsday threats range from very real, nuclear arsenals, to controversial, global warming, to futuristic - nanotechnology, cyborgs, and robots.

We examine more threats--both natural and manmade--that may endanger civilization; from the far reaches of space to tiny viruses, doomsday sources are many.

Nuclear research ranges from well-known applications, such as bombs and reactors, to little-known uses in medicine, food preparation, and radiation detection. It's also spawned ancillary technologies to store nuclear waste and clean up accidents.

Nuclear submarines carry more firepower than all bombs dropped in history; since the 1950s, these steel vessels became U.S. defense cornerstones, sparking Cold War underwater competition and creating engineering miracles for deterrence.

Wartime research and development have revolutionized communication, transportation, and medicine; from Spam to nuclear power to hairspray and cell phones, life as we know it ironically owes a lot to war.

Tiny weapons may not sound impressive, but small can kill, and it can also be easily concealed; from a pocket pistol used by the police to a submachine gun wielded by a bodyguard, many of today's most effective weapons are smaller than ever.

On a proving ground, you can fire a missile without scaring the neighbors or lift millions of pounds in pursuit of ounces of gold. Performance is the only thing that matters, and no excuses can be given in battle or competition.

From the unimaginable power of nuclear bombs to microscopic anthrax spores, we reveal who possesses these nightmare weapons and explore the danger posed by terrorists with deadly technologies.