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

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

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Physics
The term ''equinox' means

When the day and night are of equal duration
The path which the Earthtakes around the Sun
The axis of the Earth around which it rotates
The time when the Sun seems to be going round and round in the sky in the Arctic but does not go below the horizon

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