Physics
When a vehicle passes, TV reception gets distorted. This is because

Metal reflects radiowaves
Modern vehicles use electroignition system
Vehicle pollution affects the performance of the TV components
Spark plug creates electromagnetic disturbances

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Physics
Siphon will fail to work if:

The temperature of the liquids in the two vessels are the same.
The level of the liquid in the two vessels are at the same height.
The densities of the liquid in the two vessels are equal.
Both its limbs are of unequal length.

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

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
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking

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