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"I'd rather be corrected than be wrong in peace." — Aylin Muzaffarli

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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?

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?

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

Chemistry Everyday Life

corrosion · rust · iron · oxidation · electrochemical · electrolyte · water · oxygen · temperature · corrosion rate · metal · aluminum · gold · rust spreading

Why do metals corrode? What does the rate of corrosion depend on? Why does rust keep spreading?

Chemistry Biology Everyday Life

apple browning · enzymatic browning · oxidation · enzymes · pH · acid · lemon juice · water · salt water · sugar water · fruit browning · food chemistry · plant cells · oxygen reaction · freshness

Why does a cut apple turn brown when exposed to air, and which other fruits or vegetables do the same thing?

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