This chart has been extremely helpful to me in school and is full of weird approximation like the two above.
I don't have them any longer. An easy way to do it is have a friend pick out videos for you (or have someone post links to videos here and have someone pm them for the answer). Or while on YouTube look for names that you've heard before but not quite remember clearly which is not really reliable but its better then nothing.
There is something to be said to improving the quality of life as well as saving lives. In scientific and discovery fields such as pure math, contributions could improve the quality of life exponentially.