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

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure inside is less than the pressure outside.

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The electrons have more energy than the light particles
The wavelength of electrons is smaller as compared to the wavelength of visible light
The velocity of electron is smaller than that of visible light
It uses more powerful lenses

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