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Interactive walkthrough of the Set Transformer (Lee et al. 2019): equivariance vs invariance, attention, multi-head, MAB, SAB/ISAB, PMA, and the full encoder–decoder. Drag controls and permute inputs to see how data moves through each block.

A tabbed reference for engineers shipping AI features: API & local providers, model types, embeddings & vector DBs, chunking methods and RAGFlow, a from-scratch RAG implementation, tool calling, structured output, agents & MCP, and production concerns (cost, reliability, safety). Includes a section mapping every concept to real full-stack AI job requirements.

Simulation of the three body problem in physics and a few of the stable solutions.

An introduction to set theory - what is a set and what operations can be done with them?

Interactive walkthrough of the DNABERT paper (Ji et al., 2021) — k-mer tokenizer, masked pre-training, self-attention binding-site finder, benchmarks, and variant-effect demo.

Interactive review of "Self-Attention Attribution" (Hao et al., AAAI 2021). Editable Q/K/V attention computation (with a note on toy d_k=2 dimensions), a runnable integrated-gradient attribution demo, a rebuilt Figure 1 heatmap, and three use cases including an interactive step-through of Algorithm 1 (attribution tree construction) with play/step controls and an animated tree. Self-contained: React + Tailwind, all visuals inline SVG.

Interactive walkthrough of blockchain from first principles — live SHA-256 hasher, a tamperable 4-block chain, and a real in-browser proof-of-work miner with adjustable difficulty. Covers consensus, UTXO vs account models, and when a blockchain is (and isn't) the right tool.

Interactive two-section intro to quantum computing and quantum physics. Live linear algebra under the hood: an interactive Bloch sphere, a Rabi-oscillation pulse driver showing how superposition is physically created, Born-rule shot sampling, a Bell-pair entanglement demo, a 2-qubit statevector circuit simulator, and a line-by-line Qiskit walkthrough.

A comprehensive grad-level RL reference covering DQN, PPO, SAC, MuZero, AlphaZero, Dreamer, Decision Transformer and more. Includes animated MDP loop diagram, Bellman/policy-gradient math walkthroughs, syntax-highlighted code snippets, a live interactive Q-learning gridworld trainer, and real-world production use cases (Tesla FSD, OpenAI Five, RLHF, plasma control).

A reference sheet to common and useful algorithms.

Simple view of the solar system with details on each planet.

Kinematics introduction and cheat sheet - all you need for algebraic kinematics.

Electrons at work. An introductory guide to electricity, magnetism, energy storage, and circuit design - from first principles to real projects.

A from-scratch WebGL explorer (no library) that renders a sphere, box, and tetrahedron as real triangle meshes and teaches the graphics pipeline. Hand-written column-major matrix math (perspective, rotation, translation) feeds a vertex shader; a fragment shader colors each pixel either by camera depth (red near → blue far) or with Lambert lighting — the same shader, two modes, shown side by side. A tessellation slider rebuilds the GPU buffers live (with triangle/vertex counts), a wireframe pass exposes the actual primitives, and drag/scroll orbit the model. Teaching panels include a clickable 5-stage pipeline diagram (CPU vs GPU vs fixed-function), the exact vertex and fragment GLSL being compiled, the per-shape mesh generator shown verbatim, a condensed WebGL setup walkthrough (compile, link, buffers, attributes, draw), and a WebGL-vs-OpenGL comparison table (lineage, GLSL ES vs desktop GLSL, fixed-function history, programmable stages, sandboxing, conventions). Depends on no external libraries.

An interactive Three.js reference that builds three solids — a sphere, a box, and a tetrahedron — entirely out of small spheres placed on the surface. Each shape has its own tab and a resolution slider: the sphere uses an angle step (latitude/longitude rings via cosθ/sinθ), while the box and tetrahedron use a subdivision count (linear interpolation across faces and barycentric sampling of triangles), with shared edges de-duplicated. Every sphere is colored by its live distance to the camera — red when nearest, sweeping through green to blue at the far side — recomputed each frame as the model rotates. All spheres render in a single InstancedMesh for one draw call. Drag to orbit, scroll to zoom, toggle auto-rotate and a faint surface guide. Each tab also shows the exact JavaScript generator it runs.

Interactive engineering reference for payroll / HR-tech / onboarding workflows: core concepts with design patterns, working code with logic walkthroughs and tradeoffs, production frameworks, and real companies (Paylocity spotlight) with stacks and what to learn to get in.

Interactive reference on graph databases for AI/ML: property-graph vs RDF models, Cypher/Gremlin/SPARQL with annotated code walkthroughs, Neo4j vs Amazon Neptune, GraphRAG and semantic search, plus a landscape comparison. Features a draggable property-graph visualization with query highlighting.

Five core data mining techniques — Classification (k-NN), Clustering (k-means), Association Rules, Anomaly Detection, and Regression — each with a formal definition, worked example, and live interactive demo.

An interactive flashcard study guide for A Court of Silver Flames (ACOSF) by Sarah J. Maas, featuring 200 trivia questions sourced from fan wikis and book-accurate quizzes. Flip cards to reveal answers, filter by 20 categories, shuffle your deck, track mastered cards, and browse the full Q&A list — perfect for trivia night prep or testing your Prythian knowledge.

Interactive simulation of 2D ball reflection off walls, including an angled surface. Toggle between dot product and trigonometric approaches to see identical physics computed two ways, with per-bounce debug output showing projection scalars, angle, and velocity vectors.

An educational interactive tool for visualizing the normal (Gaussian) probability distribution. Adjust the mean (μ) and standard deviation (σ) in real time to see how they shape the bell curve. Features a pure SVG-rendered PDF plot with hover tooltips showing z-scores and cumulative probabilities, a toggleable histogram of random samples generated via the Box-Muller transform, key statistics (variance, peak density), and a live comparison of the 68-95-99.7 empirical rule against actual sample data — demonstrating the Law of Large Numbers as sample size increases.

Design pattern walkthroughs.

A walkthrough of a transformer in neural networks.

Overview of different machine learning approaches.

An introduction to topology.

Demonstration of how splitting a rectangle into fourths always results in 4 triangles of equal area.

Demonstration of the unit circle and how cos, sin, and tan are found.