Physics
It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Centre of gravity falls within the body
Resultant weight of buckets is zero
Weights of buckets are balanced
Centre of gravity and centre of equilibrium fall within the feet

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Physics
Analog synthesis refers to a technology based on

Representing physical quantities as numbers.
Interfacing synthesizer equipment.
Representing data in terms of measurable physical quantities.
Placing brief digital recordings of live sounds under the control of a synthesizer keyboard.

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