Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
luminous heavenly bodies that twinkle
non-luminous heavenly bodies

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Physics
Superconductors are those elements

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

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