**Logic Gates using Toys (time: 2:37)**

http://www.youtube.com/watch?v=H-53TVR9EOw

**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/**

**This site presents an interesting logic
calculator:**

**
http://www.inf.unibz.it/~franconi/teaching/propcalc/**

**These sites considers
logic gates (with links to other logic topics):**

**
http://www.phys.ualberta.ca/~gingrich/phys395/notes/node122.html**

http://www.jhu.edu/~virtlab/logic/log_cir.htm

**This site, Basic Gates and Functions,
provides a nice discussion of logic circuits:**

**http://www.ee.surrey.ac.uk/Projects/Labview/gatesfunc/index.html**