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The electric shock comes in many forms, including lightning, stun guns, eels and the electric chair.

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Geological history from the Stone Age to the Space Age; moon rocks provide clues to how planets were formed; quarrying marble and granite; blasting at a sand-and-gravel pit.

Rocks

Some say pigs are as smart as 3-year-old humans; turning pigs into bacon, ham, ribs and sausage; boar semen collection; the use of pig organs in medicine.

The Pig

Corn is the largest agricultural crop in the world, and it is used in more than 3,000 diverse items, ranging from food to the plastic wrap for packaging it.

Corn

Inventions for holding off a global warming meltdown include giant solar energy towers, a rooftop wind turbine, a car that runs on air and a kite that tows a cargo ship.

Environmental Tech II

Tools and weapons that cut; razors; swords; lasers; plasma.

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A look at the many uses of acid; the military harnesses acid to make explosives; at a sulfuric acid plant, acid takes the stain out of stainless steel and dissolves precious metals; the Heinz vinegar plant; acid-loving bacteria.

Acid

Freezer unit filled with 135 million pounds of ice cream; Alcor, where researchers keep cadavers on ice in hopes of future revival.

Deep Freeze

Extreme Aircraft II

How batteries are made, what they power and what uses they may have in the future.

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Trapping black bears with West Virginia Division of Natural Resources biologists; trapping and releasing feral cats left stranded in New Orleans after Hurricane Katrina.

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Stories of those who believed in dreams and defied the commonplace with their extraordinary creations; covering some of the world's architectural and engineering structures, scientific inventions, and social wonders.

S13 E41 | Rocks