Water Clock

You fill it with water and it operates as any normal LCD digital clock - displaying the date and time in easy to read digits. The water powered clock doesn't require any batteries.

In fact, you can fill it with any pop or fruit juice, even coffee or beer and it will still work. A clear casing allows you to see your beverage of choice inside the clock.

Here is how it works

The secret is that the water clock is a battery.

Inside is an electrolyte cell with two metal posts.

An electrolyte battery or cell (see: organic battery also: baghdad battery) needs two dissimilar metals - one copper and one zinc - and a connection between them to complete a circuit.

When the posts are immersed in a liquid that conducts electricity (water) then electrons flow from one post to the other creating a current.

The electric current powers the clock. If you add fruit juice, or soda pop, it makes the liquid more conductive.