Absolutely great website. I became aware of this website from a math class I had a couple of years ago. The information is relevent for any type of research needed from Bio's on Mathematicians, math history timelines, to curve theories.
Easy to use and one of (if not) the most extensive online resources I was able to find in regards to researching obsure mathematicians.
Time spent reviewing site:
I have been on this website recently within the last two weeks and again this past weekend for at least an hour. Very useful site!