Physics
It is dangerous to observe Solar eclipse with naked eyes because

Infrared radiations from sun burn our retina
Ultraviolet radiations from Sun burn our retina
Cosmic rays reach eyes more during the eclipse
All radiations from sun initiate chemical reactions in eyes

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Physics
Stars twinkle because

None of these
the intensity of light emitted by them changes with time.
the refractive index of the different layers of the earth's atmosphere ch
the distance of the stars from the earth changes with time.

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