Physics
The swing of a spinning cricket ball in air can be explained on the basis of

Buoyancy of air.
Turbulence caused by wind.
Sudden change in wind direction.
Bernoulli's theorem.

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Physics
Siphon will fail to work if:

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

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