The Nature of Mathematics, 12th Edition
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Chapter1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
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Section 1.3

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/

Reference Topics

Figure 1.13 uses size comparisons in the universe to introduce scientific notation. This dynamite site, called "Powers of Ten" is not to be missed. Do not be impatient as it loads -- it is worth the wait.
http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/index.html

Scientific Notation in Everyday Life, Significant Digits:
http://www.math.toronto.edu/mathnet/questionCorner/scinot.html

We introduced calculators in this section, and even though I try not to recommend commercial sites, I will make these two an exception. Both Texas Instruments and Hewlett Packard have excellent sites, with a great deal of useful information:
http://www.ti.com
http://www.hp.com/calculators/index-us.html

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