Physics
Light houses are places with powerful lights to :

Guide and help large crowds at religious gathering during nights
Indicate to the incoming warships, the location of a harbour during night
Guide and resolve traffic jams in crowded metro-cities during nights
Guide and warn the ships coming from different directions in the ocean

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Physics
Pressure Cooker cooks faster because

The material of the cooker is a good conductor
Higher temperature is attained for cooking
It cooks the food at low pressure
Boiling point decreases with rise of pressure

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