The 20-route learning estate
eduKateSengkang is organised as a Learning Castle: existing subject hubs, level routes, examination routes and learning-system pages retain their jobs. This page is the master upgrade directory. It does not replace those owners. It makes the work visible, assigns every upgrade to one route, and gives new or substantially revised articles stable IDs so later batches can be connected without losing track of what is complete.
Numbering rule
Each route has a -000 hub pointer. Article slots then use reserved tens: -010, -020, -030 and so on. The first upgrade programme reserves up to 150 article slots per route, ending at -1500. Existing high-value URLs are upgraded in place wherever practical; the ID identifies the editorial job, not a requirement to create a new URL.
| Route | Hub ID | Primary job | Existing owner / destination | Reserved article IDs | Status |
|---|---|---|---|---|---|
| SK-01 | SK-01-000 | Homepage, Sengkang Tuition, commercial/navigation/root accuracy | Homepage / Tuition Centre owner | SK-01-010–SK-01-1500 | OPEN |
| SK-02 | SK-02-000 | Primary 1–3 English | Primary English Learning Hub | SK-02-010–SK-02-1500 | OPEN |
| SK-03 | SK-03-000 | Primary 4–6 English + PSLE English | Primary English Learning Hub / PSLE Learning Guide | SK-03-010–SK-03-1500 | OPEN |
| SK-04 | SK-04-000 | Secondary 1–2 English | English Hub | SK-04-010–SK-04-1500 | OPEN |
| SK-05 | SK-05-000 | Secondary 3–4 English + SEC English | English Hub | SK-05-010–SK-05-1500 | OPEN |
| SK-06 | SK-06-000 | Vocabulary, grammar, reading, writing and English skills | Complete English Index | SK-06-010–SK-06-1500 | OPEN |
| SK-07 | SK-07-000 | Primary 1–3 Mathematics | Mathematics Hub | SK-07-010–SK-07-1500 | OPEN |
| SK-08 | SK-08-000 | Primary 4–6 Mathematics + PSLE Mathematics | Mathematics Hub / PSLE Learning Guide | SK-08-010–SK-08-1500 | OPEN |
| SK-09 | SK-09-000 | Secondary 1–2 Mathematics | Mathematics Hub | SK-09-010–SK-09-1500 | OPEN |
| SK-10 | SK-10-000 | Secondary 3–4 Mathematics + SEC Mathematics | Mathematics Hub | SK-10-010–SK-10-1500 | OPEN |
| SK-11 | SK-11-000 | Additional Mathematics | Additional Mathematics owner | SK-11-010–SK-11-1500 | OPEN |
| SK-12 | SK-12-000 | Primary 3–4 Science | Science Hub | SK-12-010–SK-12-1500 | OPEN |
| SK-13 | SK-13-000 | Primary 5–6 Science + PSLE Science | Science Hub / PSLE Science Learning Guide | SK-13-010–SK-13-1500 | OPEN |
| SK-14 | SK-14-000 | Secondary Science + scientific reasoning | Science Hub | SK-14-010–SK-14-1500 | OPEN |
| SK-15 | SK-15-000 | Learning Castle, Learning Runtime and study methods | Learning Runtime Hub | SK-15-010–SK-15-1500 | OPEN |
| SK-16 | SK-16-000 | Examination performance, revision, assessment and error repair | Examination Craft | SK-16-010–SK-16-1500 | OPEN |
| SK-17 | SK-17-000 | Parent guides, tuition, teaching and student support | Parents’ Guide | SK-17-010–SK-17-1500 | OPEN |
| SK-18 | SK-18-000 | Algorithms, computing and advanced mathematics | Algorithms & Computing Hub | SK-18-010–SK-18-1500 | OPEN |
| SK-19 | SK-19-000 | Advanced science and world-knowledge science material | Complete Science Index | SK-19-010–SK-19-1500 | OPEN |
| SK-20 | SK-20-000 | Estate archaeology: duplication, location leakage, orphan control, cannibalisation and consolidation candidates | Learning Castle Registry | SK-20-010–SK-20-1500 | OPEN |
Article register
The first-wave titles and status ledger are live in the eduKate Sengkang Article Register | SK-01 to SK-20. Use it to claim the next article ID, see protected owners and avoid duplicating work already active in another branch.
Protection-first reader standard
All 20 branches now follow the eduKate Sengkang Reader Experience Standard: protect strong pages, connect isolated pages, improve formatting only where it helps, use bounded surgery for specific defects, and modernise only when the existing article no longer completes its reader job.
Article state
Every inspected URL receives one state before work begins: PROTECT for ranking or strategically sensitive owners; KEEP for sound pages needing no substantial rewrite; MODERNISE for useful but outdated pages; SURGERY for small bounded repairs; RETARGET for pages that need a distinct adjacent search job; CONSOLIDATION CANDIDATE for overlapping intent that requires owner review; LOCATION LEAKAGE for misplaced locality; or HISTORICAL for material worth preserving without major reinvestment.
Completion rule
An article ID becomes complete only when the assigned existing URL or new article has a defined reader job, correct owner, current factual scope, useful internal return path and no unresolved collision with another Sengkang owner. A branch can therefore inspect more than 150 URLs without rewriting 150 pages. The 150 slots are a controlled first-wave capacity, not a quota.
Castle relationship
This programme sits under the existing Learning Castle and follows its one-owner-many-routes rule. English, Mathematics, Science, Examination Craft, Learning Runtime and Algorithms retain their existing canonical roles. The master directory exists to coordinate upgrades and make unfinished work visible; it does not create twenty competing subject hubs.
Complete-index crosswalk
Use the 20 routes above to decide ownership and upgrade work. Use these Complete Archives when the job is enumeration, orphan control or direct deep-article discovery.
English Archive · Mathematics Archive · Science Archive · Examination Archive · Learning Runtime Archive · Algorithms & Computing Archive
Deep fallback discovery
The subject hubs and Complete Archives remain the preferred routes. These live indexes are the final orphan-control layer: they expose every published Page and Post through paginated internal links so newly published or unusually placed content still has a crawlable return path while specialist routing is updated.
Browse every published Page
2756 results found
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Primary 4 Mathematics Learning Guide | Angles, Protractor Reading, Symmetry and Spatial Construction
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Primary 4 Mathematics Learning Guide | Area, Perimeter, Angles, Symmetry and Nets
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Primary 4 Mathematics Learning Guide | Assumption Method: Supposition, Excess, Difference and Word Problems
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Primary 4 Mathematics Learning Guide | Before-and-After Problems: Unknown Start, Change and Final Quantity
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Primary 4 Mathematics Learning Guide | Composite Figures, Missing Lengths and Boundary Tracing
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Primary 4 Mathematics Learning Guide | Constant Difference: Equal Changes, Comparison and the Gap That Stays the Same
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Primary 4 Mathematics Learning Guide | Constant Total: Transfers, Redistribution and the Quantity That Does Not Change
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Primary 4 Mathematics Learning Guide | Data, Word Problems, Strategy Choice and Self-Checking
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Primary 4 Mathematics Learning Guide | Decimal Measurement, Place Value and Rounding Accuracy
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Primary 4 Mathematics Learning Guide | Diagnostic Assessment, Capability Profile and Repair Routing
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Primary 4 Mathematics Learning Guide | Division, Remainders, Equal Grouping and Quotient Interpretation
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Primary 4 Mathematics Learning Guide | Equal Concept: Equal at First, Equal at End and Before–After Models
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Primary 4 Mathematics Learning Guide | Error Atlas, Misconceptions, First Weak Link and Correction
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Primary 4 Mathematics Learning Guide | Factors, Multiples, Common Factors and Common Multiples
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Primary 4 Mathematics Learning Guide | Fraction Addition, Subtraction, Common Denominators and Mixed Contexts
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Primary 4 Mathematics Learning Guide | Fraction Word Problems, Reference Wholes and Mixed Numbers
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Primary 4 Mathematics Learning Guide | Fractions, Decimals and Number Relationships
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Primary 4 Mathematics Learning Guide | Grouping Concept: Quantity × Value, Equal Sets and Regrouping
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Primary 4 Mathematics Learning Guide | Home Learning, Homework Independence and Parent Support
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Primary 4 Mathematics Learning Guide | Length: Kilometres, Metres, Centimetres and Compound Units
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Primary 4 Mathematics Learning Guide | Mass: Kilograms, Grams and Compound Units
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Primary 4 Mathematics Learning Guide | Mathematical Communication, Complete Working and Explanation
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Primary 4 Mathematics Learning Guide | Mixed Problem Laboratory, Interleaving and Transfer
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Primary 4 Mathematics Learning Guide | Mixed-Topic Problems, Representation Choice and Error Recovery
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Primary 4 Mathematics Learning Guide | Money in Decimal Notation, Change, Budgeting and Word Problems
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Primary 4 Mathematics Learning Guide | Multiple Solution Routes: Choosing, Comparing and Verifying Mathematics Strategies
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Primary 4 Mathematics Learning Guide | Multiplicative Comparison, Bar Models and Unknown Units
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Primary 4 Mathematics Learning Guide | Nets, 2D Representations and 3D Spatial Reasoning
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Primary 4 Mathematics Learning Guide | Number Sequences, Rounding, Estimation and Approximation
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Primary 4 Mathematics Learning Guide | Part-Whole, Difference and Equal-Group Models: Choosing the Correct Bar Model
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Primary 4 Mathematics Learning Guide | Patterns and Generalisation: Observe, Predict, Test and Explain
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Primary 4 Mathematics Learning Guide | Practice Paper: Arithmetic, Reasoning and Mixed Review with Worked Solutions
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Primary 4 Mathematics Learning Guide | Problem Posing, Changing Conditions and Creating Valid Questions
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Primary 4 Mathematics Learning Guide | Repeated Identity: Linked Comparisons, Shared Quantity and Model Drawing
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Primary 4 Mathematics Learning Guide | Revision Strategy: Topic Checklist, Weak-Link Repair and Assessment Readiness
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Primary 4 Mathematics Learning Guide | Shortage and Surplus: Excess, Deficit, Fixed Groups, Left Over and Short Of
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Primary 4 Mathematics Learning Guide | Simplifying Problems: Smaller Numbers, Simpler Cases and Rebuilding the Original
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Primary 4 Mathematics Learning Guide | Single Unchanged Quantity: Constant Single Subject and Before–After Reasoning
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Primary 4 Mathematics Learning Guide | Special Cases, Boundaries, Counterexamples and Impossible Cases
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Primary 4 Mathematics Learning Guide | Speed and Accuracy: Efficient Working, Pacing and Error Prevention
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Primary 4 Mathematics Learning Guide | Systematic Listing, Tables and Guess-and-Check
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Primary 4 Mathematics Learning Guide | Tables, Line Graphs, Pie Charts and Scale Reading
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Primary 4 Mathematics Learning Guide | Translating Representations: Words, Tables, Number Lines, Bar Models and Equations
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Primary 4 Mathematics Learning Guide | Unitary Method: One Unit, Fractional Part, Find the Whole and Scale Up
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Primary 4 Mathematics Learning Guide | Volume of Liquid: Litres, Millilitres and Compound Units
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Primary 4 Mathematics Learning Guide | Whole Numbers, Factors, Multiples and the Four Operations
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Primary 4 Mathematics Learning Guide | Working Backwards: Inverse Operations and Missing Quantities
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Primary 4 Mathematics Learning Hub | Number, Fractions, Geometry, Data and Problem Solving
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Primary 4 Mathematics Sengkang | The Voyage of Water
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Primary 4 Mathematics Sengkang | Upper-Primary Straddle Diagnostic
Browse every published Post
3746 results found
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How to Learn Cellular Iron Homeostasis: From Transferrin Uptake to Ferritin, Ferroportin and Ferroptosis
5–8 minutes -
The Tutor Handbook Vol No.0133 | The Explanation-Language Gate — How a Tutor Makes an Idea Easier to Understand Without Simplifying Away the Academic Language the Learner Must Eventually Use
18–27 minutes -
The Tutor Handbook Vol No.0132 | The Professional Relationship Boundary — How a Tutor Builds Trust With a Learner Without Letting Warmth, Personal Contact or Secrecy Expand the Teaching Role
16–24 minutes -
PSLE Science Reality Lab Vol No.093 | “No Added Substance Q” — Does That Prove the Final Product Contains None?
9–13 minutes -
PSLE Science Reality Lab Vol No.093 | “No Added Substance Q” — Does That Prove the Final Product Contains None?
8–12 minutes -
PSLE Science Reality Lab Vol No.092 | “Measured to 12.347” — Do Extra Decimal Places Mean the Experiment Measured That Precisely?
7–11 minutes -
PSLE Science Reality Lab Vol No.091 | “We Used the Same Test Surface for Both” — Did the First Trial Change the Starting Conditions for the Second?
8–12 minutes -
PSLE Science Reality Lab Vol No.091 | “We Used the Same Test Surface for Both” — Did the First Trial Change the Starting Conditions for the Second?
8–12 minutes -
PSLE Science Reality Lab Vol No.090 | “The Graph Flatlines at 100” — Did the Process Stop, or Did the Sensor Run Out of Range?
7–11 minutes -
The Tutor Handbook Vol No.0131 | The Peer-Explanation Boundary — How a Tutor Lets One Learner Explain Without Turning Them Into the Group’s Assistant or Letting Others Borrow Understanding
19–29 minutes -
The Tutor Handbook Vol No.0130 | The Correct-Answer Audit — How a Tutor Decides When a Right Answer Still Needs a Reasoning Check Without Turning Every Success Into an Oral Examination
17–26 minutes -
The Tutor Handbook Vol No.0129 | The Feedback Timing Gate — How a Tutor Decides What Must Be Corrected Now, What Can Wait and What the Learner Should Revisit Before Receiving Help
17–26 minutes -
The Tutor Handbook Vol No.0128 | The Shared-Error Reteach Gate — How a Tutor Decides When the Same Mistake Across Three Learners Needs One Collective Repair and When the Group Should Branch
17–26 minutes -
The Tutor Handbook Vol No.0127 | The Measurement Range Check — How a Tutor Notices When a Progress Check Is Too Easy or Too Hard to Show Real Change Before Reading the Score
17–26 minutes -
The Tutor Handbook Vol No.0126 | The Alternative Method Gate — How a Tutor Decides Whether an Unfamiliar Learner Method Is Valid, Useful and Assessable Without Forcing the Model Answer
18–26 minutes -
The Tutor Handbook Vol No.0125 | The Criterion Drift Check — How a Tutor Keeps the Standard Stable Enough to Read Progress Without Quietly Becoming Harsher, Softer or More Demanding Over Time
18–27 minutes -
The Tutor Handbook Vol No.0124 | The Task-Purpose Gate — How a Tutor Decides Whether a Question Is for Teaching, Practice, Diagnosis, Progress Monitoring or Verification Before Deciding What Help Is Allowed
14–22 minutes -
PSLE Science Reality Lab Vol No.089 | “Highest Ever” — Ever Since When?
8–12 minutes -
PSLE Science Reality Lab Vol No.088 | “30% Less Material” — Less Per Pack, or Less for the Same Number of Uses?
8–12 minutes -
PSLE Science Reality Lab Vol No.087 | “Absorbs Twice as Much” — Were the Same Amounts of Material Tested?
9–13 minutes -
PSLE Science Reality Lab Vol No.086 | “The Solid Line Becomes Dashed” — Where Did the Measurements End and the Projection Begin?
9–13 minutes -
The Tutor Handbook Vol No.0123 | The Tutor Selection Gate — How a Tuition Programme Decides What Must Be Present Before Hiring and What Can Responsibly Be Built Through Training
20–30 minutes -
The Tutor Handbook Vol No.0122 | The Attendance Differential — How a Tutor Separates Logistics, Load, Relationship and Avoidance Before Treating Missed Sessions as a Motivation Problem
16–24 minutes -
The Tutor Handbook Vol No.0121 | The Session Cadence Gate — How a Tutor Chooses Frequency and Gaps Between Lessons Without Treating the Same Total Hours as the Same Learning Opportunity
17–26 minutes -
The Tutor Handbook Vol No.0120 | The Fresh-Item Reserve — How a Tutor Keeps Some Questions Untaught and Unrehearsed So Later Checks Still Test the Learner Rather Than the Memory of Practice
17–26 minutes -
The Tutor Handbook Vol No.0119 | The Recording Window — How a Tutor Captures Useful Learning Evidence Without Missing the Live Reasoning They Need to Observe
17–25 minutes -
The Tutor Handbook Vol No.0118 | The Knowledge Boundary — How a Tutor Handles a Question They Cannot Answer Reliably Without Bluffing or Outsourcing Judgement to Search or AI
17–25 minutes -
The Tutor Handbook Vol No.0117 | The Tutor Error Repair — How a Tutor Corrects Their Own Wrong Explanation, Marking or Advice Without Hiding the Error or Destabilising the Learning Route
18–26 minutes -
The Tutor Handbook Vol No.0116 | The Provisional Language Gate — How a Tutor Explains Uncertain Learner Evidence to Parents Without Turning a Working Hypothesis Into a Label
18–27 minutes -
PSLE Science Reality Lab Vol No.085 | “Lasts Twice as Long” — Did Both Tests Use the Same End Point?
8–12 minutes -
PSLE Science Reality Lab Vol No.084 | “The Slice Got Bigger” — Did the Actual Amount Increase, or Did the Whole Get Smaller?
7–11 minutes -
PSLE Science Reality Lab Vol No.083 | “Both Maps Are Red” — Does Red Mean the Same Value on Both Maps?
7–11 minutes -
The Tutor Handbook Vol No.0115 | The Submission Boundary — How a Tutor Supports Assessed School Work Without Becoming the Author of What the Learner Submits
17–26 minutes -
PSLE Science Reality Lab Vol No.082 | “The Total Keeps Rising” — Does That Mean the Process Is Speeding Up?
8–12 minutes -
The Tutor Handbook Vol No.0114 | The Homework Collision Gate — How a Tutor Decides When Urgent School Work Should Replace the Planned Lesson and When It Should Not
18–26 minutes -
PSLE Science Reality Lab Vol No.081 | “12 Failures Versus 8” — Were the Same Number of Items Tested?
9–14 minutes -
PSLE Science Reality Lab Vol No.080 | “The Average Passed the Limit” — Does That Mean Every Item Passed?
10–15 minutes -
PSLE Science Reality Lab Vol No.079 | “Four Samples Were Mixed Before Testing” — Does One Pooled Result Describe Every Location?
11–16 minutes -
PSLE Science Reality Lab Vol No.078 | “The Bars Look Far Apart” — Did the Axis Start Close to the Data?
10–15 minutes -
The Tutor Handbook Vol No.0113 | The Training Need Gate — How a Tutor Coach Separates a Tutor-Skill Gap From a Material or System Problem Before Assigning More Training
17–26 minutes -
The Tutor Handbook Vol No.0112 | The Priority Arbitration Gate — How a Tutor Resolves Conflicting Requests From Learner, Parent and School Without Letting One Voice Quietly Set the Learning Route
18–27 minutes -
The Tutor Handbook Vol No.0111 | The Missing Baseline — How a Tutor Reports Progress When Teaching Began Before a Clean Starting Measure Was Collected
18–27 minutes -
The Tutor Handbook Vol No.0110 | The Accommodation Baseline — How a Tutor Compares Progress Without Treating Legitimate Access Supports as Noise or Quietly Changing Them Between Checks
17–26 minutes -
The Tutor Handbook Vol No.0109 | The Criteria Disclosure Gate — How a Tutor Makes Success Visible Without Turning Success Criteria Into a Step-by-Step Answer Key
16–25 minutes -
The Tutor Handbook Vol No.0108 | The Tutor-Side Check — How a Tutor Tests Whether Their Own Explanation, Example, Prompt or Sequence Created the Difficulty Before Diagnosing the Learner
17–26 minutes -
PSLE Science Reality Lab Vol No.077 | “The Cells Look Bigger” — Were the Two Images Taken at the Same Scale?
10–15 minutes -
PSLE Science Reality Lab Vol No.076 | “The Headline Says ‘Stops Growth’” — Did the Study Only Show Slower Growth in This Test?
9–13 minutes -
PSLE Science Reality Lab Vol No.075 | “The Video Shows the Whole Experiment” — Was Anything Cut Out Between the Steps?
10–15 minutes -
PSLE Science Reality Lab Vol No.074 | “It Survived the Drop Test” — Were Both Products Dropped the Same Way?
11–17 minutes -
PSLE Science Reality Lab Vol No.073 | “Both Lines Start at 100” — Were Their Real Starting Values the Same?
10–15 minutes
Routing rule: use this fallback only for discovery and orphan control. Canonical subject ownership, reader pathways and return logic continue to come from the Learning Castle, subject hubs and Complete Archives.
