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Chris Long and Mike Groth's Modulated Light DX pages preserve decades of amateur optical communication experiments, including a 167-kilometer audio-modulated light link across Tasmania.
Polarization.com turns polarized light into an old-school science museum covering rainbows, bees, insects, Viking sunstones, Edwin Land, sunglasses, displays, optics history, and experiments.
Philip Gibbs's 1996 Physics FAQ page compresses a subtle question about rods, dark adaptation and photon detection into the kind of compact scientific explanation the early Web did exceptionally well.