Physics
Thermohaline circulation is mainly due to

Winds causing circulation of ocean water
Warm water being added to the ocean due to industial waste
Cold, dense ocean water sinking and warmer water replacing it
Warmer, less dense water sinking in the ocean and cold water replacing it

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

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