90% of people who try to do this are successful. What is it?

In 1974 there were over 50,000 of these in the U.S., now there are hardly any. What are they?

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Almost 5000 people each year go to the emergency room after being injured by this. What is it?

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In it's 51 year history, this only happened once on Wheel Of Fortune. What is it?

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20% of people find this sound to be annoying. Others think it's soothing. What is it?

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90% of people who try to do this are successful. What is it?

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