Write-ups on physics, math, and things I built.
Lagrangian mechanics derivation of the simple pendulum — equations of motion and what they tell us.
PhysicsTheory and interactive simulation of a second-order mechanical system — the building block of control engineering.
How It WorksInside the 2D barcode: encoding, error correction, and the finder patterns that make them scannable from any angle.
Earth ScienceZoomable timeline of major events in Earth's 4.5-billion-year history — from formation to the present day.
BiologyInteractive mind map of the animal kingdom — explore the classification hierarchy from kingdom down to species.
PuzzleStep-by-step solving manual for the 5×5 cube with illustrated move sequences.
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