The 2020-03-26 Rationality class lecture on a rational model for climate action will be recorded and posted later.

No deadline is given; judge by the end of the spring 2020 semester (2020-05-31). True: a recording of the 2020-03-26 Rationality class lecture on a rational model for climate action was posted publicly (e.g. on YouTube, Harvard's course site, or linked from Pinker's account) by then. Mostly true: the recording was posted but the topic or date is slightly different from the description (e.g. the lecture was moved to another day). Mostly false: only part was posted (e.g. slides or notes only, not a recording), or it was posted after 2020-05-31. False: positive evidence that it was not posted, such as a later statement from Pinker or the course that the lecture was not recorded or would not be released, or the published list of course lecture videos leaving it out.

Set before the research began.

1. E1 Rationality Spring 2020, Tues & Thurs 1:30-2:45 Harvard ... stevenpinker.com (course syllabus PDF, General Education 1066: Rationality) Own record

   “Lectures: You must attend all the lectures; as a rule, recordings of the lectures will not be available.”

2. E2 Rationality Spring 2020, Tues & Thurs 1:30-2:45 Harvard ... stevenpinker.com (course syllabus PDF, General Education 1066: Rationality) Own record

   “Thurs, Mar. 26: Climate change. Guest lecturer: Solomon Goldstein-Rose, former”

3. E3 News stevenpinker.com (Steven Pinker website news archive) · 5 August 2020 Own record

   “Lectures on Rationality August 05, 2020”

4. E4 Media and Appearances stevenpinker.com (Steven Pinker website) Own record

   “Streaming video of GENED 1066: Rationality lectures at Harvard University”

5. E5 General Education 1066: Rationality Harvard University (course syllabus hosted on stevenpinker.com) · 2020 Own record

   “Lectures: You must attend all the lectures; as a rule, recordings of the lectures will not be available.”

6. E6 General Education 1066: Rationality Harvard University (course syllabus hosted on stevenpinker.com) · 2020 Own record

   “Thurs, Mar. 26: Climate change. Guest lecturer: Solomon Goldstein-Rose, former Mass. State Representative.”

7. E7 Steven Pinker’s Harvard Course on Rationality deeshaa.org (blog) · 4 May 2020

   “Rationality: All 25 lectures from my Harvard Gen Ed course here.”

8. E8 Steven Pinker’s Harvard Course on Rationality deeshaa.org (blog) · 4 May 2020

   “Here are the lecture videos.”

9. E9 6th Selected Links josephnoelwalker.com (Joseph Walker podcast blog) · 29 January 2021

   “Steven Pinker's Harvard Rationality course is available online.”

The syllabus schedules a Thursday, March 26 climate change session with guest lecturer Solomon Goldstein-Rose (E2, E6), and says that as a rule recordings of the lectures will not be available (E1, E5). An independent blog post dated 2020-05-04 relays "All 25 lectures from my Harvard Gen Ed course here" and "Here are the lecture videos" (E7, E8). Pinker's site lists streaming video of the Rationality lectures on an undated page (E4) and an item titled "Lectures on Rationality" dated August 2020 (E3), and a 2021 post says the course is available online (E9). None of these sources lists the posted lectures by name. E7 relays that all 25 lectures were available by 2020-05-04, but it does not confirm that the March 26 climate lecture was among them.