Why Roller Coasters Wouldn't Exist Without Coal Mining

Humans are strange, thrill-seeking creatures. We crave not just a thrill, but something so terrifying that we think, if only for a moment, that we might not actually survive. For those of us not ready for base jumping in wing suits, roller coasters can fulfill that excitement lust. And the amusement park fixtures may… » 3/01/12 1:00pm 3/01/12 1:00pm