How many calories does clicking a mouse burn?

mouseBased on a typical index finger having a volume of 10.8 cubic centimetres and weight of 11.7 grams, it it should require 16.7 micromoles of ATP (Adenosine triphosphate, the molecule that transports energy in cells) to move one gram of the body for one second.

Converting that quantity of ATP into burned calories for the whole finger — there are 7.3 calories in one mole of ATP energy — a single mouse click should, in theory, burn 1.42 calories.

Source: Yahoo Japan