Breathe and charge, charge and breathe

The power of breathing in his constancy. We spend a lot of energy just breathing. Smart people have figured out how to turn it into a useful course, for example, to charge devices connected via a USB port.

The idea is simple. The device, using the power of breathing, charges the usual AA finger-type battery, which in turn charges the USB device connected to it.

Unfortunately, the invention is far from perfect. To charge only one battery, you need to carry this charger all day.
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Source: Gadget Blog