"Reductionism 101" is the a sequence of essays (assigned letter P) in Mere Reality, volume four of the Rationality: From AI to Zombies ebook. These were originally posts on Overcoming Bias, and the essay names below link to the original blog pages:
190. Wrong Questions
191. Righting a Wrong Question
193. Probability is in the Mind
194. The Quotation is not the Referent
196. Think Like Reality
197. Chaotic Inversion
198. Reductionism
199. Explaining vs. Explaining Away
200. Fake Reductionism
201. Savanna Poets
The previous essay sequence is "Lawful Truth," and the next one is "Joy in the Merely Real."