This chapter was all about spinning. I liked it - not only because it again featured a lot of tea (she seems to drink and stare at tea A LOT!) but it also had action and suspense (literally if you read about the trebuchet experiments).
While I can't see myself building a trebuchet myself (I'll wait for Murder by Death's detailed report on that particular experiment), I really enjoyed reading about it. It does illustrate her points rather well. I might, however, be observing the toast rotation experiment with less frustration going forward.
I again had to smile because I was reminded of the Humboldt biography (The Invention of Nature) when she mentioned Mount Chimborazo.