Site Log

What's new and what's changed — reverse chronological order.

2026-05-02

  • 22:39 — Content(ap-csp): add complete AP Computer Science Principles study guide
  • 22:15 — Content(ib-history-sl): expand women & gender policy section to cover all five regimes
  • 22:09 — Content(ap-environmental-science): add complete APES study guide + Phase 1 AP infrastructure

2026-04-26

  • 03:37 — Rewrite title tags on 3 near-page-1 guides for CTR boost

2026-04-25

  • 17:34 — Content(site): add CS Topics 2-4, homepage bounce fix, mobile flashcard swipe + bottom nav
  • 15:50 — Content(ib-bio-hl): add Stephanie Castle video sections to neural signaling and ecology guides
  • 03:25 — Content(ib-cs-sl): add video section to computational-thinking guide

2026-04-24

  • 15:41 — Content(site): complete TOK guide quality pass and add Business SL video sections

2026-04-23

  • 16:10 — Add IB Spanish B SL/HL subject with complete guide and flashcard deck
  • 03:40 — Add 2026 recency signal to Business SL and CS SL titles
  • 03:32 — Expand flashcard deck to cover 8 missing guide sections

2026-04-22

  • 15:35 — Content(ib-ee): add flashcard deck and route for Extended Essay
  • 04:09 — Content(ib-business-sl): add Operations Management guide for Unit 5
  • 03:46 — Content(ib-business-sl): add Human Resource Management guide for Unit 2

2026-04-21

  • 15:44 — Content(ib-business-sl): add Marketing guide for Unit 4
  • 04:07 — Content(ib-cs-sl): add Topics 2-4 guides and expand flashcard deck
  • 03:32 — Escape currency dollar signs in finance-accounts prose

2026-04-20

  • 16:00 — Content(ib-business-sl): add Finance & Accounts guide for Unit 3
  • 15:23 — Content(ib-cs-sl): add Computer Science Café video section to system-fundamentals

2026-04-19

  • 15:47 — Add bridging paragraphs to empty h2 sections
  • 15:37 — Content(site): add flashcard decks and pages for IB CS SL and Business SL
  • 15:09 — Downgrade pdfPath missing severity to medium for new guides
  • 03:58 — Add orienting paragraphs to 12 empty h2 sections
  • 03:54 — Add ib-history-hl SubjectCard to homepage

2026-04-18

  • 15:26 — Remove comingSoon flag from ib-history-hl nav entry
  • 15:24 — Clarify vertical forward integration row in M&A table
  • 13:30 — Content(site): add IB Computer Science + Business Management — first Tier 2 subjects
  • 13:01 — Add missing excerpt frontmatter to Units 2-4
  • 12:14 — Content(ib-econ-sl): add Microeconomics, Macroeconomics, and Global Economy guides + PDFs
  • 11:38 — Correct assessment weights — Essay 67% out of 10, Exhibition 33% out of 10
  • 03:35 — Generate all 45 missing PDFs for guides added since content expansion

2026-04-17

  • 15:27 — Content(ib-math-aa-hl): add IA Ideas sections to calculus, complex numbers, and statistics guides
  • 03:48 — Content(ib-psych-sl): add Abnormal Psychology HL option guide

2026-04-16

  • 15:45 — Add overflow-x scroll to callout boxes on mobile
  • 15:41 — Content(ib-physics-sl): add Theme D Fields guide

2026-04-15

  • 16:27 — Content(ib-physics-sl): add Themes B, C, E guides and fix SL scope gates (, , , )
  • 15:41 — Content(ib-psych-sl): add Cognitive and Sociocultural Approach guides

2026-04-14

  • 15:45 — Content(site): add video sections to all 5 Wave 5 guides
  • 03:30 — Content(site): add flashcard decks and routes for Wave 5 subjects
  • 03:29 — Content(site): optimize title/description for 5 high-impression zero-CTR pages

2026-04-13

  • 15:36 — Launch Wave 5 subjects — Physics SL, Econ SL, Psych SL, TOK, EE (, , , , )

2026-04-12

  • 15:19 — Content(ib-math-ai-sl): expand flashcard deck with 15 sub-section cards
  • 03:20 — Correct two flashcard errors found by reviewer
  • 03:12 — Content(ib-math-aa-hl): expand flashcard deck with calculus and geometry/trig cards

2026-04-11

  • 15:43 — Content(ib-history-sl): expand flashcard deck from 47 to 112 cards
  • 15:07 — Remove undocumented 'hl' field from flashcard cards
  • 03:17 — Content(ib-history-hl): add flashcard deck and page

2026-04-10

  • 23:51 — Correct le cadet definition and add le benjamin
  • 23:16 — Content(ib-bio-hl): add flashcards for Theme A/B/C expansions
  • 23:15 — Content(ap-french): add exam strategy cards to flashcard deck
  • 23:14 — Content(ib-chem-sl): add flashcards for classification, stoichiometry, and R3 expansions
  • 23:03 — Add IB 2029 curriculum transition plan
  • 22:50 — Apply grid fix to homepage index.astro
  • 19:52 — Content(bio-hl, history-sl, lang-lit): add practice questions for Priorities 4-6
  • 19:49 — Content(ib-chem-sl): add Chemistry SL data booklet page with periodic table, constants, and equations
  • 19:49 — Content(ib-lang-lit): add flashcard deck and page — 58 cards across 5 topics
  • 19:49 — Content(ap-french): add flashcard deck and page — 103 cards across 10 topics
  • 19:49 — Content(ib-math-ai-sl): add flashcard deck and page — 70 cards across 7 topics
  • 19:47 — Content(ap-french, ib-chem-sl): add practice questions for vocab themes and R3.1/R3.2
  • 19:40 — Stop homepage grid cards stretching on incomplete last row
  • 18:59 — Wire ib-lang-lit and ib-math-ai-sl to all entry points
  • 15:09 — Add title and description to 3 high-impression zero-click pages
  • 03:10 — Add IB Language A and Area of Exploration keywords to title tags and descriptions

2026-04-09

  • 15:06 — Correct syllabus codes and metadata in enzymes and photosynthesis guides

2026-04-08

  • 15:13 — Replace coming-soon placeholder with dynamic guide list
  • 03:45 — Shorten IA guide excerpt to fit schema max
  • 03:36 — Correct chi-squared df and compound interest notation in IA guide
  • 03:30 — Add Internal Assessment guide — Mathematical Exploration
  • 03:16 — Replace teal with blue across all Math AI SL color tokens
  • 03:07 — Remove 'coming soon' placeholder; add AP French practice questions

2026-04-07

  • 22:51 — Add proper French diacritical marks to all guide content
  • 22:33 — Remove 8 duplicate guides — keep main comprehensive guide + practice questions
  • 15:22 — Add IB Language A Language & Literature subject with 3 area guides
  • 03:10 — Add frontmatter description support to GuideLayout + Math AI SL SEO descriptions
  • 03:05 — Add AP nav dropdown to site header

2026-04-06

  • 23:53 — Content(ap-french): add video embeds and resource links to exam guide
  • 23:43 — Content(ap-french): collapse Bellevue-specific info into expandable details section
  • 23:41 — Content(ap-french): add Bellevue WA exam-day details — date, format, Audacity, ID, accommodations, BC credit
  • 23:38 — Filter technical entries from What's New banner
  • 23:38 — Swap video iframes to data-src for lazy loading inside collapsed details (bug-video-lazy-details)
  • 23:38 — Group Math AA and Math AI under single Mathematics card (bug-math-ai-title)
  • 23:35 — Content(ap-french): add 9 separate AP French study guides (ap-french-guide, ap-french-bellevue)
  • 23:24 — Content(ap-french): add AP French Language & Culture guide — first AP subject (ap-french-guide, ap-french-bellevue)
  • 22:59 — Fix dollar signs parsed as KaTeX math delimiters in prose text
  • 22:56 — Connect Math AI SL guides to homepage and add subject color (bug-math-ai-disconnected)
  • 15:34 — Fix unclosed worked-example divs and trailing newline in Labster sections
  • 15:30 — Content(ib-bio-hl): add Labster virtual lab alignment sections to three Bio HL guides
  • 15:27 — Fix pre-existing KaTeX dollar-sign errors in functions, calculus, number-algebra
  • 15:23 — Correct prediction question errors — TVM values, normal dist, regression
  • 15:04 — Content(ib-math-ai-sl): add May 2026 prediction questions to all 5 topic guides

2026-04-05

  • 19:04 — Content(ib-math-ai-sl): add Math AI SL as new subject with all 5 topic guides
  • 18:47 — Add missing History HL route pages and handle large-page screenshot crash
  • 18:21 — Content(ib-math-aa-hl): add IB Maths Resources videos to calculus and complex numbers
  • 15:25 — Content(ib-bio-hl): add continuity-change guide covering mutations, CRISPR, water potential, reproduction, and HL gene expression
  • 15:15 — Add content previews, difficulty badges, and study order callout to subject index pages (design-subject-preview)
  • 15:11 — Increase whitespace and hide HR dividers in guides (design-whitespace)
  • 03:08 — Strengthen callout visual differentiation (design-callout-color)
  • 03:06 — Make what's new cards link to guides
  • 00:42 — Rewrite hero copy and add social proof stat bar (design-hero-cta, design-social-proof)
  • 00:28 — Content(ib-bio-hl): add evolution-biodiversity and adaptation-muscle guides, expand neural signaling with C3.1
  • 00:28 — Content(ib-chem-sl): expand organic-chemistry guide with acid-base and redox sections

2026-04-04

  • 22:54 — Add per-subject OG image cards and auto-select in layout
  • 22:37 — Content(site): add 5 new guides — neural signaling, ecology, biochemistry, conquest, conflict (, , , )
  • 22:36 — Content(ib-bio-hl,ib-chem-sl,ib-math-aa-hl): add May 2026 prediction questions to 8 guides
  • 20:22 — Content(ib-history-sl): add Military Leaders Prescribed Subject 1 guide
  • 20:20 — Content(ib-history-sl): add World History Topic 9 democratic states guide
  • 20:20 — Content(ib-history-sl): add Independence Movements guide (Topic 8, order 17)
  • 20:19 — Content(ib-chem-sl): add Classification of Matter and Stoichiometry guides
  • 20:18 — Content(ib-history-hl): add Paper 3 Section 14 inter-war Europe depth study guide
  • 20:04 — Content(ib-history-sl): add Rights and Protest prescribed subject guide
  • 19:37 — Correct syllabus naming and ordering to match IBO numbering scheme
  • 19:37 — Correct guide ordering, titles, and syllabus codes to match IBO Topic 1-5 sequence
  • 19:37 — Correct guide ordering and titles to match IBO syllabus structure
  • 19:37 — Correct syllabus codes and guide ordering to match IBO 2025 syllabus
  • 19:22 — Content(ib-history-sl): add 20th-century wars study guide (Topic 11, )
  • 19:21 — Content(ib-history-sl): add Cold War study guide (Topic 12)
  • 19:17 — Content(ib-math-aa-hl): add Topic 3 Geometry and Trigonometry guide
  • 15:08 — Content(ib-math-aa-hl): add May 2026 prediction questions to calculus guide
  • 03:21 — Remove duplicate h1 and imprecise Vmax term in enzymes exam questions
  • 03:12 — Content(ib-bio-hl): add IB exam-style questionbank to Bio HL guides

2026-04-03

  • 15:13 — Include polar bonds in video-2 nav and section label
  • 15:09 — Content(ib-chem-sl): add MSJChem video sections to bonding and thermodynamics guides
  • 03:31 — Correct CO2 transport and alveoli count in physiology guide
  • 03:25 — Content(ib-bio-hl): add Form & Function Physiology guide covering A4.1–A4.3
  • 03:20 — Content(ib-math-aa-hl): add polynomial division & theorems section to functions guide
  • 03:14 — Content(ib-math-aa-hl): add Section 6 Polynomial Division, Factor & Remainder Theorems to functions guide

2026-04-02

  • 15:21 — Correct Gaussian elimination title and formula booklet tip
  • 15:17 — Correct pedigree X-linked clue and MCQ Q3 in meiosis guide
  • 15:12 — Content(ib-math-aa-hl): add Number & Algebra guide covering Topic 1
  • 15:08 — Content(ib-bio-hl): add Meiosis, Genetics & Inheritance guide
  • 03:29 — Content(ib-chem-sl): add Reactivity 2 Rates of Reaction & Equilibrium guide
  • 03:25 — Content(ib-chem-sl): add Rates of Reaction & Equilibrium guide covering Reactivity 2.2–2.3
  • 03:19 — Replace How-to-Use preamble with topic-coverage header on enzymes and calculus guides
  • 03:05 — Replace How-to-Use preamble with topic-coverage header on enzymes and calculus pages

2026-04-01

  • 15:15 — Add periodic trend SVG diagram to atomic-structure guide

2026-03-31

  • 15:30 — Clean up atomic-structure guide post-simplify+review
  • 15:07 — Content(ib-chem-sl): add Atomic Structure & Periodicity guide covering Structure 1.1–1.5
  • 03:34 — Add SVG aria-labels, fix clip-path ref, align inverse definition with IB syllabus
  • 03:28 — Content(ib-math-aa-hl): add Functions guide covering subtopics 2.1–2.5
  • 03:22 — Correct cholesterol and peripheral protein positions in fluid mosaic SVG
  • 03:12 — Content(ib-bio-hl): add fluid mosaic membrane model SVG diagram

2026-03-30

  • 15:42 — Content(ib-bio-hl): add A1 Unity & Diversity guide — cell biology and ultrastructure
  • 15:12 — Add collapsible video sections to enzymes and DNA guides
  • 03:22 — Add dark mode with warm palette, nav toggle, and localStorage persistence
  • 03:09 — Fix singular "guide" labels in homepage count bar

2026-03-29

  • 21:54 — Add gamification-lite preview page
  • 21:54 — Add inline recall prompts to all guides
  • 21:36 — Add dark mode preview page with toggle
  • 21:36 — Add exam-style question bank with mark schemes
  • 21:12 — Add fading worked examples and animated mechanism walkthroughs
  • 20:58 — Add rolling what's-new banner to homepage
  • 20:32 — Generate missing PDFs for bonding-structure, calculus, and statistics-probability
  • 20:27 — Add IB Chemistry SL Thermodynamics & Gibbs Free Energy guide
  • 19:55 — Add interleaved mixed practice sections to all 9 guides
  • 19:41 — Add historical photographs to Authoritarian States guide
  • 19:34 — Add IB Chemistry SL Bonding & Structure guide
  • 19:28 — Add IB Chemistry SL Bonding & Structure guide (Structure 2)
  • 19:24 — Add IB Math AA HL Statistics & Probability guide
  • 19:10 — Add IB Math AA HL Statistics & Probability study guide
  • 18:26 — Fix Political Spectrum diagram overlapping text in Authoritarian States guide
  • 18:17 — Add Mao/Castro dedicated sections, fun elements, and cross-region practice questions to Authoritarian States guide
  • 17:22 — Add 5 data visualizations to Authoritarian States guide
  • 17:11 — Expand Authoritarian States with Mao & Castro, verify IB syllabus ordering
  • 16:31 — Add IB History guide: Authoritarian States — Hitler, Stalin, Mussolini
  • 15:25 — Add A2 DNA Replication & Gene Expression guide
  • 11:29 — Add video discoverability — badge and per-page index
  • 11:12 — Add jump navigation to Enzymes & Cell Biology guide

2026-03-28

  • 23:36 — Add plain-language concept introductions across all guides
  • 23:18 — Add IB Math AA HL Calculus guide (1330 lines)
  • 19:51 — Fix math PDF ASCII graphs and add Bio HL Enzymes & Cell Biology guide

2026-03-23

  • 01:43 — Fix search dead-ends on mobile and add sticky section navigator
  • 01:34 — Remove broken YouTube video embed from Bio HL guide
  • 01:25 — Add feedback button with floating FAB, modal form, and GitHub Issues API
  • 01:21 — Add curated video sections to Math AA HL, Chemistry SL, and History SL guides
  • 01:12 — Convert Chemistry SL guide to .mdx to fix KaTeX in HTML blocks
  • 00:40 — Add collapsible video sections to guides with curated YouTube embeds
  • 00:19 — Add tap-to-expand lightbox for SVG diagrams on mobile and tablet
  • 00:17 — Add "Made for and by IB students" hero message and contributor credits in footer
  • 00:08 — Make homepage subject count dynamic instead of hardcoded

2026-03-22

  • 23:51 — Add IB History SL study guide — The Move to Global War
  • 23:28 — Fix search input padding to clear magnifying glass icon
  • 23:24 — Add complete isomer structures for C5H12 and C4H8 to Chem SL guide
  • 23:18 — Replace ASCII diagrams with SVG visuals in Math AA HL guide
  • 23:08 — Add Pagefind search to site header
  • 22:57 — Improve mobile responsiveness for smartphones and iPads
  • 22:53 — Show content types on homepage with feature row
  • 22:42 — Add scroll-spy TOC, sticky header, and section breaks to guides
  • 22:38 — Hide Coming Soon sections and add value prop to hero
  • 22:09 — Add PDF download button at top of guide pages
  • 19:41 — Update bio, chem, and math guides for content accuracy
  • 19:24 — Fix MCQ options displaying on single line
  • 19:12 — Add formula booklet integration to math guide
  • 19:07 — Add 40 IB-style practice questions to chemistry guide
  • 19:00 — Add esterification section and expand homologous series in chem guide
  • 18:55 — Fix 5 reviewer issues and add 4 remaining bio diagrams
  • 18:41 — Add SVG diagrams to biology guide and regenerate PDFs
  • 18:28 — Add Astro study guide site with 3 verified IB guides