Fruit Clock

Nothing impresses kids more than doing cool science tricks with everyday household items, and this Fruit Clock will certainly entertain and enlighten them. When you stick the clock's two metal electrodes into a fruit such as a lemon or an apple, the metals react with the fruit's natural acids to form a low-power battery, enough to keep a digital clock running! Comes with a handy booklet explaining the science behind this reaction. $11.99 USD.