Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another
If you conserve energy you will not be as tired

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

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
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 atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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