Physics
'Parsec' is the unit measurement of

Brightness of heavenly bodies
Orbital velocity of giant stars
Density of stars
Astronomical distance

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Physics
What is the principle of a ''Life Jacket"?

The person can sit on it like a raft
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat
It increases the volume of the person to keep him afloat

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