What was the primary failure of the scarf that prompted Greenwood to seek a more engineered solution?

Answer

The fabric kept slipping

Greenwood initially tried wrapping a scarf around his head, but it consistently slipped, failing to offer adequate, secure protection.

What was the primary failure of the scarf that prompted Greenwood to seek a more engineered solution?

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Ear Muffs: Where did they come from? | Stuff of Genius - YouTube

The history of how earmuffs were invented by a Maine teenager

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