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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Physics
Superconductors are substances which

conduct electricity at low temperature
offer high resistance to the flow of current
conduct electricity at high temperatures
offer no resistance to the flow of electricity

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