Or the labor unions that allow us higher wages to pay to visit the parks, the fewer hours to allow us the time to visit the parks, the abundance of resources to produce the rides... The sources are endless!
But in terms of more modern people/places/things to thank, I'd say one (among many) would have to be every roller coaster fanatic that has demanded bigger, better, faster, steeper, more inversions, more airtime, more thrills... Without us, there would be no industry to grow!
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html Check out the BEHIND-THE-SCENES of roller coasters!