The Book of Why
The Book of Why by Judea Pearlby Judea Pearl
Shares rank 10 of 19 mathematics books by recommenders
Recommended as a layman-friendly introduction to causal thinking, with graphical explanations of direct and indirect effects and the history of statistics.
5 people recommended The Book of Why by Judea Pearl in Hacker News comments and 1 criticized it, November 2025 to October 2026.
Summary written by Claude from 7 comments.
6 people gave an opinion
- recommend it
- 5
- mixed feelings
- 0
- warn against or regret it
- 1
The record
Recommended in 5 of 12 months
In 5 different threads.
- November 2025: not recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: not recommended
- April 2026: recommended
- May 2026: not recommended
- June 2026: not recommended
- July 2026: recommended
- August 2026: not recommended
- September 2026: not recommended
- October 2026: not recommended
Why it doesn’t carry the badge
- 5 people recommend itNeeds 10 or more, not met.
- 5 recommenders for every criticNeeds 2 to 1 or better, met.
- Recommended in 5 of 12 monthsNeeds 4 or more, met.
- Recommended in 5 threadsNeeds 5 or more, met.
- The biggest thread supplies 20% of its recommendersNeeds half or less, met.
The same rules apply to every product, and the badge can’t be bought. Mixed feelings count toward neither side. How the badge works
What people say about it
Reasons grouped from a sample of 7 of the 9 opinions about it, picked in proportion to how many people recommend it, have mixed feelings and criticize it. Each mark is one comment in the sample. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Accessible introduction to causal reasoning
“See The Book of Why, by Judea Pearl for an introduction to how that works.”
Comment from 18 Feb 2026 in “Mark Zuckerberg Lied to Congress. We Can't Trust His Testimony” “something layman friendly like Pearl’s Book of Why”
Comment from 5 Dec 2025 in “Covid-19 mRNA Vaccination and 4-Year All-Cause Mortality”
Other mathematics books people recommend
The four most recommended other mathematics books, with the same counts for each, so you can compare like for like. The tick on each bar marks the 2 to 1 line the badge needs.
| Product | Recommend | Mixed | Criticize | Approval | Months | Had for | Badge |
|---|---|---|---|---|---|---|---|
| Elements by Euclidby Oliver Byrne | 14 | 2 | 9 | 61% | 8 | — | — |
| Fermat's Last Theoremby Simon Singh | 11 | 0 | 0 | 100% | 3 | — | — |
| Gödel's Proofby Nagel and Newman | 9 | 0 | 1 | 90% | 2 | — | — |
| Mathematica: A Secret World of Intuition and Curiosityby David Bessis | 8 | 0 | 0 | 100% | 6 | — | — |
| The Book of Whyby Judea PearlThis page | 5 | 0 | 1 | 83% | 5 | — | — |
What people said
7 of the 9 opinions about it, picked in proportion to the three counts, newest first. Each links to the original comment.
“I liked the graphical approach to help outline exactly how one thinks about direct and indirect effects”
“there was/is a very clear trend to replace the default male pronoun for gender neutrality with the female pronoun she”
“Pearl tells the history of statistics in his book”
“looks pretty good which probably does a better job than my quick summary”
“See The Book of Why, by Judea Pearl for an introduction to how that works.”
“Andrew Gelman has an interesting review of the book”
“something layman friendly like Pearl’s Book of Why”
Counts come from 1,791,911 Hacker News comments labeled by Claude, November 2025 to October 2026, with data through October 31, 2026. Counts updated 2 Nov 2026. How we count. Report a mistake.