What activity was Chester Greenwood engaged in when his ears became uncomfortably chilled?

Answer

Ice skating

The necessity for the invention arose while Greenwood was out ice skating and found his ears freezing.

What activity was Chester Greenwood engaged in when his ears became uncomfortably chilled?

#Videos

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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