Physics
In severe winter, in cold countries water pipes burst because

Contraction of water pipes
Water expands on freezing
Combined effect of all the above three
High atmospheric pressure

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Physics
Planets do not twinkle because

Their distance from the earth does not change with time
They are nearer to earth and hence we receive a greater amount of light.
They emit light of a constant intensity
They are very far away from the earth resulting in decrease in intensity of light

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