Physics
During hot weather, the fan produces a feeling of comfort. This is because

Fan cools the air
Conductivity of air increases
Fan supplies cool air
Our perspiration eva-porates rapidly

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Air-gaps are necessary for bearing the weight of running train
Accidents due to contraction in winter can be avoided
Steel can be saved
Accidents due to expansion in summer can be avoided

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