One thing, a lot of sanctioned races (outside the Olympics) offer extra money prizes if a world record is broken at their event. The Olympics don't need to offer the money because they get enough publicity already.
I have nothing to base that on, its just a guess.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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