Clock powered by lemons
Most people know that a lemon can be very acidic and would take some effort to eat one. However, there is a good use for lemons and it is not cutting them up to put them in a drink either. This is a clock that does not need power from batteries, solar or even the mains, because the clock can get enough power from a lemon to make the clock work.
To make it work, the lemon is cut in half and each half is then placed onto the two copper and zinc prongs and that is it, a lemon, lime or orange will produce enough power to run the clock for around a week and make the room smell nice too.
Source [Oh Gizmo]
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