It's the only rock we eat, and we need it to live. History has shown that those who have salt rule the world--and today, this versatile substance has 14,000 known uses. Travel to a salt mine 1,800 feet below Lake Erie where workers blast salt from a massive deposit spanning four states, to an evaporation facility near San Francisco where machines harvest salt from the briny ocean. Visit a Florida restaurant that offers 40 different varieties of salt...and journey to New York to explore salt's surprising number one application: de-icing snowy winter roads. See how a high-tech desalination plant removes salt from ocean water, producing 25 million gallons of drinkable water every day. And if it's speed you're after, look no further than a natural drag strip in Utah made of pure salt.