The Rule of 70 and the Rule of 72 are two popular shortcuts that can help investors quickly estimate the doubling time of an investment. These rules are particularly useful for grasping the potential ...

At the age of 10, Benjamin Franklin left formal schooling to become an apprentice to his father. As a teenager, he showed no particular talent or aptitude aside from his love of books. When he died a ...

WHENEVER a particular type of calculation is to be repeated frequently, the use of slide rules, nomograms or graphs eliminates a major part of the time required. This is frequently the case in ...