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#DailySkeptoid: Airplanes' ground effect is due to the lack of space for drag-causing vortices. No such thing as a "cushion of air".
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While I agree with you, because you are technically correct, the cushion of air analogy is not terrible. The lack of space for the vortices is what provides the upwelling force. All words are attempts to transfer ideas. Cushion of air may not be perfect, but it will impart something close to reality. 

Learning to golf I realized two things. 

1. All the instruction I found in magazines was wrong. 
2. After I learned how to hit a golf ball well, I realized that most of the instruction was correct, the instruction was just subject to misinterpretation by my imperfect brain. 
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