Physics
We feel cool when we sit near the fan, this is because

Fan gives cool air.
Fan cools surrounding air.
We feel cool when air touches the body.
Air vapourises the sweat on our body.

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

The material of which pipes are made contracts due to cold and so breaks
Water in the pipes freezes and on freezing water expands, so pipes break
None of these
Frost makes the pipes rusty, so they break

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