Physics
The force that binds the neutrons and protons in a nucleus is called as:

Strong Nuclear Force
Electromagnetic Force
Gravitational Force
Weak Nuclear Force

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

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