I loved "Prof. E. McSquared's Calculus Primer" when I was learning Calculus (look for used prices):

http://www.amazon.com/gp/product/0913232475/ref=olp_product_...

Home page here: http://www.math.sjsu.edu/~swann/mcsqrd.html

Fun and funny, written in a comic book format. It illustrates the concepts in such an entertaining style, but makes the point better than many textbooks.

Along those lines, you might enjoy _Thinking Physics_. (http://www.amazon.com/Thinking-Physics-Understandable-Practi...)

If you're downloading over SSH, can anyone really know what you're downloading? In other words, what's the likelihood of getting caught?

Over Usenet? Very unlikely that a casual leecher will get caught unless your ISP is doing deep packet inspection. Consuming Terabytes of data a month might arouse suspicion at your ISP, but that's regardless of Usenet or Bittorrent. 90% of good newsgroup providers offer SSL transfers these days anyways, but if someone is sniffing your line and inspecting your data, you have bigger problems than how to download the new Avengers movie securely.