Physics
We always see the same face of the moon, because

It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth

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

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