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

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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water
Density of the substance to the density of water at 0°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 4°C

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