Physics
Oil rises up the wick in a lamp because

Oil is very light
Of the surface tension phenomenon
Of the capillary action phenomenon
Of the diffusion of oil through the wick

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

metals have higher thermal capacity than plastics
metals are good conductor of heat
plastics have a higher thermal conductivity than metals
plastics have a lower density than metals

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