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Every single Onewheel is being recalled after four deaths
(www.theverge.com)
This is a most excellent place for technology news and articles.
The onewheel seems like a personal-mobility answer to the V22 Osprey: a vehicle with amazing functionality and versatility in its happy path, but is fundamentally unsafe in failure because of the basic physics of the situation. If it ever even momentarily loses power, the nose drops and bites the asphalt and the rider goes flying.