General Claims and their Contradictories

For me, this chapter was particularly hard to understand. The boxes on pages 160-161 were very useful for me. In those boxes, it explains the meanings of the indicator words: All, Some, No, and Only. Whenever I was confused on a portion of Chapter 8, I looked back to these boxes as a reference. The main thing I got out of Chapter 8 was the ability to really dissect a claim.
For example, the other week my sister and I got in to an argument. She argued that some baseball players are tall and some are short, and that all baseball teams have both tall and short players. I knew that this was not a valid argument but I had no way of proving it. However, with the tools I learned in Chapter 8, now I know for a fact that her argument was not valid. Because even though baseball is filled with tall and short players, that does not mean every team has both.