Physics
We always see the same face of the moon, because

It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis
It is smaller than the earth
It revolves on its axis in adirection opposite to that ofthe earth

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Physics
It takes much longer to cook food in the hills than in the plains, because

n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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