This is one of the best all around
sites that I have found. It is titled "The MacTutor History
of Mathematics Archive."
http://www-history.mcs.st-and.ac.uk/~history/
This is an award-winning
site that links to all sorts of mathematics information.
http://archives.math.utk.edu/
Universals
A short history is given on this site which is taken from
the Internet Encyclopedia of Philosoply.
http://www.utm.edu/research/iep/u/universa.htm
Einstein:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Einstein.html
There is a game, called WFF'N
PROOF which I first learned over 30 years ago. It
is a fun game that teaches logical prooF. I have used
in many classes over the years.
http://www.alf-learning.org/Games/wffnproof/
This wonderful site about Lewis Carroll
is delightful. Check the nine bullets for "The
Logic of Lewis Carroll."
http://www.lewiscarroll.org/logic.html