Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
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

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.
By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.

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