Physics
The sky appears blue because

All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
It is actually blue
In white light, the blue component dominates

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

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

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