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 behaves like insulating media
Air layer between two shirts works as good conductor
Two thin shirts become thicker so prevent transmission of heat

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Physics
The earth is a

Bad absorber and bad radiator of heat
Good reflector of heat
Good absorber and good radiator of heat
Non-absorber of heat

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