Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Burst after reaching some height
Reach a particular height and start coming down
Reach a particular height and remain floating

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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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