Mathematics · 8 min · Beginner
Limits and Continuity
Understand how functions behave as inputs approach a value — the foundation of calculus.
Read note → Mathematics · 12 min · Intermediate
Mastering Derivatives
A visual guide to differentiation rules, chain rule applications and real-world uses.
Read note → Mathematics · 20 min · Advanced
Linear Algebra Essentials
Vectors, matrices, eigenvalues — the language of modern data and graphics.
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Science · 10 min · Beginner
Newton's Laws in Plain English
Why objects move the way they do, with everyday examples and diagrams.
Read note → Science · 9 min · Beginner
The Cell — A Tiny Factory
How organelles work together to power life, from mitochondria to ribosomes.
Read note → Science · 14 min · Intermediate
Chemical Bonding Demystified
Ionic, covalent and metallic bonds — what holds matter together.
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History · 15 min · Beginner
Renaissance in 10 Ideas
Humanism, perspective, patronage — the concepts that rebooted Western thought.
Read note → History · 18 min · Intermediate
The Cold War — A Timeline
Key events from 1947 to 1991, with context for the ideological clash.
Read note → History · 12 min · Beginner
Ancient Mesopotamia
Cradle of civilization: writing, law, agriculture and the first cities.
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Literature · 7 min · Beginner
Reading a Poem Slowly
Five passes through a poem to unlock image, sound, syntax and meaning.
Read note → Literature · 10 min · Beginner
Hamlet — Plot in 10 Minutes
The full arc of Shakespeare's tragedy, distilled with key quotes.
Read note → Literature · 11 min · Advanced
Stream of Consciousness
Joyce, Woolf, Faulkner — how modernist prose broke the narrative form.
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Languages · 13 min · Beginner
Spanish Verb Tenses
Present, preterite, imperfect — when and why to use each one.
Read note → Languages · 9 min · Beginner
French Phonetics Basics
Nasal vowels, liaison and silent letters — speak French like a native.
Read note → Languages · 16 min · Beginner
Mandarin Tones Made Simple
Four tones, mnemonics, and the most common tone-pair mistakes.
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Computer Science · 11 min · Beginner
Big O Notation
How to describe algorithmic efficiency and why it matters.
Read note → Computer Science · 14 min · Intermediate
Sorting Algorithms Visualized
Bubble, merge, quicksort — side-by-side comparisons and trade-offs.
Read note → Computer Science · 12 min · Beginner
Recursion — A First Taste
Functions that call themselves, with classic examples and pitfalls.
Read note →Showing 18 notes · more added weekly