Links

History

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/

Isaac Newton:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Newton.html

Gottfried Leibniz:
http://www-history.mcs.st-and.ac.uk/~history/Mathematicians/Leibniz.html

Reference Topics

This is a more advanced site than we need for the introduction in this book, but check out the following choices on this site:
"The limit"
"Archimedes' calculation of pi"
"Secants and tangents"
http://www.math.psu.edu/dna/graphics.html

Zeno's paradox is discussed at this site:
http://mathforum.org/isaac/problems/zeno1.html

An interesting article on mathematical modeling and why it is important is found at this site:
http://www.mtholyoke.edu/courses/jmorrow/math_models.html