A Web Site about the design of the most exciting machines ever:

Every year American citizens pay millions of dollars to be scared to death. No, I'm not talking about the IRS; I'm talking about the roller coaster. Roller coasters are the most exciting machines in the world. They let us experience sensations once known only to astronauts. They feel wild and out of control, but they are not. Roller coasters are carefully designed using the principals of physics to give maximum thrills without compromising safety. Designers use state-of-the-art equipment to create a calculated sensation of fear. Roller coasters are fun because you know they are safe even if you feel like you are about to fall out of your seat. That is the goal of roller coaster design.
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