Physics
Water drops cannot stick to the oily surface due to

Surface tension
Lack of adhesive force
Cannot mix each other
Water is lighter than oil

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

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

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