The personal website of Ayoub Khallok, a record of curiosity about science, the universe and the ideas that shape our world: essays, research, lessons, projects and notes from books.https://ayoubkhallok.vercel.app/https://ayoubkhallok.vercel.app/quotes/learning-and-thought/https://ayoubkhallok.vercel.app/quotes/learning-and-thought/On why reading and thinking need each other.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/thats-home/https://ayoubkhallok.vercel.app/quotes/thats-home/On seeing Earth from six billion kilometres away.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/a-brief-history-of-time/https://ayoubkhallok.vercel.app/library/a-brief-history-of-time/Stephen Hawking's tour of space, time, black holes and the origin of the universe, written for anyone curious enough to ask.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/astrophysics-for-people-in-a-hurry/https://ayoubkhallok.vercel.app/library/astrophysics-for-people-in-a-hurry/Neil deGrasse Tyson's short, clear tour of the universe, written for readers with little time and lots of curiosity.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/on-the-origin-of-species/https://ayoubkhallok.vercel.app/library/on-the-origin-of-species/Charles Darwin's case for evolution by natural selection, the book that changed how we understand life.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/pale-blue-dot/https://ayoubkhallok.vercel.app/library/pale-blue-dot/Carl Sagan's reflection on a single photograph of Earth, and what our place in space should mean for how we live.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-analects/https://ayoubkhallok.vercel.app/library/the-analects/The sayings of Confucius, gathered by his students, on learning, character and how to live well with others.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-elegant-universe/https://ayoubkhallok.vercel.app/library/the-elegant-universe/Brian Greene's explanation of string theory and the search for a single theory that unites all of physics.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-first-three-minutes/https://ayoubkhallok.vercel.app/library/the-first-three-minutes/Steven Weinberg's account of what happened in the first minutes after the Big Bang, and how we know.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-selfish-gene/https://ayoubkhallok.vercel.app/library/the-selfish-gene/Richard Dawkins's gene's-eye view of evolution, and the book that introduced the word 'meme'.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/what-is-life/https://ayoubkhallok.vercel.app/library/what-is-life/Erwin Schrödinger's short, influential attempt to explain living things in the language of physics.Mon, 26 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/the-mind-of-god/https://ayoubkhallok.vercel.app/quotes/the-mind-of-god/On the hope of a complete theory.Sun, 25 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/this-is-knowledge/https://ayoubkhallok.vercel.app/quotes/this-is-knowledge/On knowing the limits of what you know.Sun, 25 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/cosmos/https://ayoubkhallok.vercel.app/library/cosmos/Carl Sagan's tour of the universe, and of the people who learned to understand it.Sun, 25 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-grand-design/https://ayoubkhallok.vercel.app/library/the-grand-design/Why is there something rather than nothing? Hawking and Mlodinow's attempt to answer the biggest questions with physics.Sun, 25 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/projects/this-website/https://ayoubkhallok.vercel.app/projects/this-website/A personal site with a portfolio, blog, research archive and knowledge library, built with Astro.Sun, 25 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/comprehensible-and-pointless/https://ayoubkhallok.vercel.app/quotes/comprehensible-and-pointless/On meaning in a universe we understand.Sat, 24 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/grandeur-in-this-view-of-life/https://ayoubkhallok.vercel.app/quotes/grandeur-in-this-view-of-life/On wonder in evolution.Fri, 23 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/survival-machines/https://ayoubkhallok.vercel.app/quotes/survival-machines/On seeing life from the gene's point of view.Thu, 22 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/in-the-light-of-evolution/https://ayoubkhallok.vercel.app/quotes/in-the-light-of-evolution/On the idea that ties biology together.Wed, 21 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/articles/learning-in-public/https://ayoubkhallok.vercel.app/articles/learning-in-public/Publishing unfinished thinking is uncomfortable. It is also the fastest way I know to get better at anything.Tue, 20 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/do-not-fool-yourself/https://ayoubkhallok.vercel.app/quotes/do-not-fool-yourself/On honesty in science.Tue, 20 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/the-grand-book/https://ayoubkhallok.vercel.app/quotes/the-grand-book/On mathematics as the language of nature.Mon, 19 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/comprehensibility/https://ayoubkhallok.vercel.app/quotes/comprehensibility/On why the universe can be understood at all.Sun, 18 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/not-playing-dice/https://ayoubkhallok.vercel.app/quotes/not-playing-dice/On Einstein's discomfort with chance.Sat, 17 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/the-present-state/https://ayoubkhallok.vercel.app/quotes/the-present-state/On determinism and the dream of perfect prediction.Fri, 16 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/nobody-understands/https://ayoubkhallok.vercel.app/quotes/nobody-understands/On how strange the quantum world is.Thu, 15 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/atoms-and-void/https://ayoubkhallok.vercel.app/quotes/atoms-and-void/On the first idea of atoms.Wed, 14 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/a-place-to-stand/https://ayoubkhallok.vercel.app/quotes/a-place-to-stand/On the power of a simple principle.Tue, 13 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/philosophy-is-dead/https://ayoubkhallok.vercel.app/quotes/philosophy-is-dead/On the claim that science has taken over the big questions.Mon, 12 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/ideas/a-personal-curriculum/https://ayoubkhallok.vercel.app/ideas/a-personal-curriculum/What if I planned my own learning in semesters, with syllabi and exams?Mon, 12 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/i-think-therefore-i-am/https://ayoubkhallok.vercel.app/quotes/i-think-therefore-i-am/On the one thing that cannot be doubted.Sun, 11 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/roots-of-education/https://ayoubkhallok.vercel.app/quotes/roots-of-education/On the cost and reward of study.Sat, 10 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/extraordinary-evidence/https://ayoubkhallok.vercel.app/quotes/extraordinary-evidence/On the burden of proof.Mon, 05 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/meditations/https://ayoubkhallok.vercel.app/library/meditations/The private journal of a Roman emperor, and why it still reads like advice from a friend.Mon, 05 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/research/momentum-and-costs/https://ayoubkhallok.vercel.app/research/momentum-and-costs/A pre-registered plan to test a classic momentum signal on public data, then charge it realistic trading costs.Thu, 01 Oct 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/projects/financial-analysis-app/https://ayoubkhallok.vercel.app/projects/financial-analysis-app/Placeholder project: a tool that turns company statements into clear ratios, charts and a written summary.Fri, 25 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/power-over-your-mind/https://ayoubkhallok.vercel.app/quotes/power-over-your-mind/On what is and is not in our control.Sun, 20 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/lessons/finance-fundamentals/cash-flow-basics/https://ayoubkhallok.vercel.app/lessons/finance-fundamentals/cash-flow-basics/Why profit and cash are different, and why cash usually wins.Tue, 15 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/articles/notes-on-compounding/https://ayoubkhallok.vercel.app/articles/notes-on-compounding/The same arithmetic that grows savings also grows knowledge. A look at what that means in practice.Mon, 14 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/lessons/finance-fundamentals/reading-an-income-statement/https://ayoubkhallok.vercel.app/lessons/finance-fundamentals/reading-an-income-statement/Revenue, margins and the line that tells you whether a business really earns money.Tue, 08 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/lessons/finance-fundamentals/reading-a-balance-sheet/https://ayoubkhallok.vercel.app/lessons/finance-fundamentals/reading-a-balance-sheet/Assets, liabilities and equity, and the three questions to ask of any company.Tue, 01 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/voting-and-weighing/https://ayoubkhallok.vercel.app/quotes/voting-and-weighing/On the short and the long run in markets.Tue, 01 Sep 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/articles/tools-for-thinking/https://ayoubkhallok.vercel.app/articles/tools-for-thinking/Notebooks, scripts and habits that turn scattered reading into usable notes.Sun, 30 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/library/the-intelligent-investor/https://ayoubkhallok.vercel.app/library/the-intelligent-investor/Margin of safety, Mr. Market, and the temperament that investing really requires.Thu, 20 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/shoulders-of-giants/https://ayoubkhallok.vercel.app/quotes/shoulders-of-giants/On building on the work of others.Sat, 15 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/research/spaced-repetition-year/https://ayoubkhallok.vercel.app/research/spaced-repetition-year/A year-long self-experiment with flashcards: the protocol, what I track, and what earlier research predicts.Wed, 12 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/ideas/notes-as-a-graph/https://ayoubkhallok.vercel.app/ideas/notes-as-a-graph/Linking every note to at least two others, and seeing what clusters appear.Tue, 04 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/quotes/simplicity-and-reliability/https://ayoubkhallok.vercel.app/quotes/simplicity-and-reliability/On building systems that work.Sat, 01 Aug 2026 00:00:00 GMThttps://ayoubkhallok.vercel.app/articles/what-old-maps-teach/https://ayoubkhallok.vercel.app/articles/what-old-maps-teach/Cartographers worked with incomplete data and still made decisions. So do we.Sat, 18 Jul 2026 00:00:00 GMT