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

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

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure of a person increases at high altitudes
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically

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