Physics
Oil raise up the wick in a lamp. The principle involves

capillary action phenomenon
the liquid state of oil
volatility of oil
the diffusion of oil through the wick

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Physics
Planets do not twinkle because

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

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