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Physics
Earth & Space
Rayleigh scattering · Mie scattering · light scattering · wavelength dependence · atmospheric scattering · sky color · sunset colors · sunrise colors · blue sky · red sky · Mars atmosphere · planetary atmospheres · atmospheric optics · redshift · photon path
Why is the sky blue? Why isn't it blue during sunsets? Why is the sky on Mars orange-ish? And why are Martian sunsets blue?
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Psychology & Brain
dopamine · reward · brain · curiosity · habit · addiction · receptors · neurons · coffee · caffeine · adenosine · boredom · neurochemistry · prediction
Why do things that once fascinated us gradually lose their magic? What happens when the reward signal is artificially pushed? What happens to dopamine after it is released? Why doesn't coffee let us sleep?
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Physics
blackbody radiation · spectrum · wavelength · temperature · thermal emission · emissivity · Stefan Boltzmann law · Wien law · ultraviolet catastrophe · Planck · quantum · energy · photons · frequency
Why do hot things glow? The UV catastrophe — and how Planck saved physics
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