Although the metric system is used almost worldwide, some countries continue to use the old imperial system, most notably America. So there is a case for knowing how to convert inches, feet and yards and miles (from the imperial system) into millimetres,...

Because of moons elliptical orbit around the Earth, the distance changes over the course of the 27.3 days it takes to orbit the Earth but the average distance between us and the moon is 385,000 kilometres or 239,227.909 miles. Although smaller than the...

It seems that there is not a definitive answer to the question of how many different countries are there in the world because it depends upon which source you utilise and for political reasons. Some places are not recognised, are pressing for sovereign...

There is no completely accurate way of knowing how many people there are on planet Earth.However, it is possible to make estimates based on census figures and rates of growth in various countries. The U.S. Census Bureau estimated the total population...