Physics
Pressure Cooker cooks faster because

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

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Physics
Mirage is due to:

Equal heating of different parts of the atmosphere
Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere

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