Joy Beeson writes:

On Sun, 11 Nov 2018 10:04:56 -0800, Jeff Liebermann
wrote:

Maybe a mask that also charges your smartphone?
https://www.dailymail.co.uk/sciencetech/article-2113539/AIRE-mask-uses-lung-power-charge-mobile-phone.html

That reminds me of the Samantha stories by "Josiah Allen's wife".
(Marietta Holley). In one book, Josiah builds a house for his
daughter, and announces that he's had the brilliant idea of hooking up
the water pump to the treadle of the sewing machine. Samantha's
"Well, I broke *that* up!" is pretty much my reaction to the
lung-powered charger.

That idea was not restricted to fiction, before widespread
electrification household water power was an option for those lucky
enough to have running water:

https://www.lowtechmagazine.com/2013...er-motors.html

This idea was successful enough that power-only water networks were
established in few places, to running motors without wasting large
amounts of potable water:

https://www.lowtechmagazine.com/2016...orks.html#more


If you make an armchair pedal turner that charges a charger, that
might be a good idea.

--