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 * Why software has convinced me to believe in the reality of cats and apples
   <https://www.edge.org/conversation/why-gordian-software-has-convinced-me-to-believe-in-the-reality-of-cats-and-apples>
 * Steal Those Buttons <http://web.archive.org/web/20100131032431/http://gtmcknight.com/buttons/>
-* <https://www.open.edu/openlearn/free-ebooks>
+* All [free courses from OpenLearn](https://www.open.edu/openlearn/free-courses) are downloadable as e-books
 * <https://numinous.productions/ttft/>
 * <https://commoncog.com/blog/in-an-age-of-knowledge-work-emotion-regulation-is-a-superpower/>
 * <https://commoncog.com/blog/dont-beat-yourself-up-over-self-directed-work/>
 * <http://www.structuredprocrastination.com/>
 * <https://commoncog.com/blog/a-user-review-of-the-procrastination-equation/>
-* In Praise of Idleness <http://www.zpub.com/notes/idle.html>
+* In Praise of Idleness <https://archive.org/details/in.ernet.dli.2015.222090/page/n11/mode/2up>
 * What We Know We Don't Know <https://hillelwayne.com/talks/what-we-know-we-dont-know/>
 * The Harmful Consequences of the Robustness Principle <https://www.ietf.org/archive/id/draft-iab-protocol-maintenance-05.html>