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

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

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Physics
The bats can fly in the dark because

They generate ultrasonic sound waves
They generate flashes of light
They can see the objects in darkness
They have weak legs and are likely to be attacked by predators

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