Physics
Bubbles of air rise up through liquids due to

Viscosity and buoyancy
Air current over the liquid and buoyancy
Surface tension and adherence
Up thrust and surface tension

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

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

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