Physics
Wollen clothes keep the body warm because

Wool rejects heat from the outer objects
Wool is a bad conductor
Wool increases the temperature of the body
Wool absorbs radiant heat from outer objects

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Physics
RADAR is used for:

locating geostationary satellites.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.
locating submerged submarines.

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