This is a presentation I gave to the Commonwealth of Pennsylvania Spring Amusement Ride Safety Seminar in February of 2008. Running time is slightly more than 49 minutes; the file is 45 megabytes, but you don't have to wait for it to download before it starts playing (hey, the original Keynote file is 75 Mb, so you're getting off easy).
Requires QuickTime version 6 or later!
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