Physics
Rainbow is due to

ionisation of water deposits
diffusion of sunlight through water droplets
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Air layer between two shirts works as good conductor
Two thin shirts become thicker so prevent transmission of heat
No radiation of heat takes place
Air layer between two shirts behaves like insulating media

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