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This whistle fights fascists | How thousands of 3D-printed whistles are derailing ICE.
(www.theverge.com)
This is a most excellent place for technology news and articles.
If you would rather invest in a quality whistle for the one that goes in your own mouth, I recommend an ACME Thunderer.
As used by gym teachers and drum majors, (not Wile E. Coyote) they have a satisfying roll of authority.