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Courses Planned
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Tiers
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Visualizations (so far)
9 courses live — 84 more planned

Hengzhe's
Science Classroom

From elementary curiosity to research frontiers — interactive, visualization-driven science education for everyone.

Start Exploring
Approach

How We Teach

Not exam prep. Not memorization. Pure understanding through interaction.

🎯
Interactive Visualizations
Drag points, adjust sliders, watch animations. Abstract concepts become tangible through hands-on exploration.
💡
Intuition First
Build deep understanding before formalism. Every theorem starts with "why" before "how to prove."
∑
Rigorous When Ready
KaTeX-rendered math with full proofs. Rigor scales with the tier — from playful to publication-grade.
🌱
Learn at Any Age
Five tiers from elementary school to research frontier. Start wherever you are, go as far as you want.
📈
Progress Tracking
Your learning progress is saved locally. Pick up right where you left off, across sessions.
🌐
Free & Open Source
Everything is on GitHub. No accounts, no paywalls, no ads. Just open the link and start learning.
Vision

A Connected Universe

Every discipline connects. From counting to cosmology, it's all one story.

Science
Classroom
📐 Math
⚛️ Physics
💻 CS
🧪 Chemistry
🌱 Foundation
🎓 Undergrad
🔬 Graduate
🚀 Frontier
📘 High School
The Journey

From Curiosity to Frontier

Five tiers of science education. Every concept gets the interactive treatment it deserves.

TIER 1

🌱 启蒙 Foundation

Elementary & Middle School — where curiosity begins

📐
Mathematics
✅
Fun Arithmetic & Number Sense
Operations, patterns, number games
LIVE
📊
Fractions, Decimals & Ratios
Visual fraction models, proportional reasoning
Planned
📐
Geometric Intuition
Shapes, symmetry, transformations
Planned
🧩
Mathematical Thinking Games
Logic puzzles, combinatorics, reasoning
Planned
🔢
Intro to Number Theory
Primes, factors, GCD, LCM
Planned
📊
Statistics & Data Science
⚛️
Physics
✅
Forces & Motion Intuition
Hewitt / Perelman / PEP Textbook
LIVE
🌈
Light & Sound
Reflection, refraction, color, waves
Planned
🔋
Simple Circuits
Circuit builder, Ohm's law, series & parallel
Planned
🌌
Intro to Astronomy
Solar system, moon phases, seasons
Planned
⚡
Energy & Conservation
KE, PE, energy transfers, simple machines
Planned
🧪
Chemistry
💧
Matter & Change
States of matter, physical vs chemical change
Planned
⚛️
Atoms & Molecules
Atomic structure, periodic table explorer
Planned
🧴
Acids, Bases & Salts
pH visualization, indicator simulations
Planned
🔥
Chemistry in Daily Life
Combustion, rust, food chemistry
Planned
TIER 2

📘 进阶 High School

High school depth — building real understanding

📐
Mathematics
📐
Algebra
Equations, functions, polynomials, logarithms
Planned
📐
Geometry
Euclidean, trigonometry, conic sections
Planned
📈
Precalculus
Limits intuition, function families, sequences
Planned
✨
The Beauty of Mathematics
Golden ratio, fractals, infinity, symmetry
Planned
📊
Statistics & Data Science
🎲
Probability & Statistics Intuition
Probability models, CLT, normal distribution
Planned
⚛️
Physics
🎯
Classical Mechanics
Newton deep-dive, work, energy, momentum, rotation
Planned
🧲
Electromagnetism
Coulomb, fields, potentials, induction
Planned
🌡️
Thermal Physics
Temperature, gas laws, thermodynamics
Planned
🌊
Optics & Waves
Wave equation, interference, diffraction, EM spectrum
Planned
🔭
Intro to Modern Physics
Relativity, quantum concepts, atomic models
Planned
🧪
Chemistry
✅
High School Chemistry
Chinese National Curriculum (Ren Jiao Ban) · 18 chapters
LIVE
TIER 3

🎓 本科 Undergraduate

University core — where rigor meets intuition

📐
Mathematics
✅
Calculus
Stewart / Spivak · 20 chapters
LIVE
📐
Linear Algebra
Strang
Planned
💻
Discrete Math
Rosen
Planned
📝
Intro to Proofs
Hammack
Planned
💻
Computer Science
💻
Intro to Programming
SICP
Planned
🌳
Data Structures
Sedgewick
Planned
🖥️
Computer Architecture
Patterson & Hennessy
Planned
📊
Statistics & Data Science
🎲
Intro to Probability
Blitzstein
Planned
⚛️
Physics
🎯
Mechanics
Kleppner & Kolenkow
Planned
⚡
E&M
Purcell
Planned
🌡️
Thermal Physics
Schroeder
Planned
🔬
Modern Physics
Krane
Planned
🧪
Chemistry
🧪
General Chemistry
Atkins / Zumdahl
Planned
🧬
Organic Chemistry
McMurry
Planned
TIER 4

🔬 研究生 Graduate

Master's & PhD — deep theory, serious proofs

📐
Mathematics
✅
Real Analysis I
Rudin / Tao
LIVE ✅
Real Analysis II
Rudin / Folland
LIVE
🔢
Abstract Algebra
Dummit & Foote
Planned
✅
Advanced Linear Algebra
Roman · GTM 135
LIVE
📊
Topology
Munkres
Planned
📗
Complex Analysis
Ahlfors
Planned
📉
ODE
Tenenbaum
Planned
📈
PDE
Evans
Planned
💻
Computer Science
✅
Algorithms
CLRS / Kleinberg & Tardos · 22 chapters
LIVE
🖥️
Operating Systems
OSTEP
Planned
🔧
Compilers
Dragon Book
Planned
🌐
Networking
Kurose & Ross
Planned
🗄️
Databases
CMU 15-445
Planned
🎨
Computer Graphics
Fundamentals of CG
Planned
📊
Statistics & Data Science
✅
Mathematical Statistics
Casella & Berger / 陈希孺 / Hogg, McKean & Craig
LIVE
📊
Statistical Modeling
Dobson / McCullagh & Nelder
Planned
🧪
Causal Inference
Imbens & Rubin / Pearl
Planned
🤖
Machine Learning
Bishop / Murphy
Planned
⚛️
Physics
⚛️
Classical Mechanics
Goldstein / Taylor
Planned
⚡
Electromagnetism
Griffiths
Planned
🔬
Quantum Mechanics
Griffiths / Sakurai
Planned
🌡️
Statistical Mechanics
Pathria
Planned
📐
Mathematical Physics
Arfken
Planned
🧪
Chemistry
🧬
Organic Chemistry
Clayden
Planned
🧪
Physical Chemistry
Atkins
Planned
💎
Inorganic Chemistry
Miessler
Planned
🔍
Analytical Chemistry
Skoog
Planned
TIER 5

🚀 前沿 Frontier

Research-level — the cutting edge of human knowledge

📐
Mathematics
✅
Algebraic Topology
Hatcher
LIVE
🌍
Differential Geometry
do Carmo
Planned
✅
Functional Analysis
Rudin / Conway / Kreyszig
LIVE
📏
Measure Theory
Folland
Planned
💎
Algebraic Geometry
Hartshorne
Planned
🔢
Analytic Number Theory
Apostol
Planned
🎭
Representation Theory
Fulton & Harris
Planned
💻
Computer Science
🌐
Distributed Systems
Kleppmann
Planned
🔐
Cryptography
Katz & Lindell
Planned
🧠
Computational Complexity
Arora & Barak
Planned
🏷️
Type Theory
Pierce
Planned
📊
Statistics & Data Science
✅
High-Dimensional Statistics
Wainwright / Vershynin / Bühlmann
LIVE
🤖
Deep Learning
Goodfellow
Planned
⚛️
Physics
✨
Quantum Field Theory
Peskin & Schroeder
Planned
🌌
General Relativity
Carroll
Planned
🧊
Condensed Matter
Ashcroft & Mermin
Planned
⚛️
Particle Physics
Griffiths
Planned
🌍
Cosmology
Weinberg
Planned
🧪
Chemistry
🧬
Advanced Organic Synthesis
March
Planned
⚛️
Quantum Chemistry
Szabo & Ostlund
Planned
🧬
Biochemistry
Lehninger / Stryer
Planned
🏗️
Materials Science
Callister
Planned