WHAT MAKES US THINK
It is the most difficult job that opens up your mental processes and makes you think. Really think. For that matter, this process is the bonus of doing genealogical research or any type of research. Interestingly, I also discovered a greatly improved capacity to memorize, especially dates and places. After all, where the ancestor was residing in 1850 (for example) is a key to opening the door to multiple records and resources.
If one can remember the name and the date, then, no matter where you are, asleep or awake, that is a living fact that is useful anytime, any place!