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

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

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.

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