Although it is true that the widespread use of base 10 may have originated with the 10 digits on human hands, this does not mean that it is completely "unnatural". In fact, base 10 is widely used in mathematics and science as a system of counting, and can be found in a variety of different contexts. For example, the metric system is based on the base 10 system, and is used in measuring distances, weights, and volumes. Furthermore, base 10 is used in digital electronics, where each bit is 1 or 0, representing two distinct states. Therefore, base 10 is not only widely accepted, but also widely used in various scientific and mathematical contexts. UrRong in saying that base 10 is "unnatural" and simply "pulled out of [some guy's] ass"; it is a widely accepted and used system of counting.