Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Whose resistance falls almost to zero at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures

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

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