Physics
Analog synthesis refers to a technology based on

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

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Physics
Lightning is produced when

Strong opposite charges in different clouds break down the resistance offered by the intervening air
Similar charges of electricity rush towards each other and then get repelled
Clouds strike against impurities in air and the friction burns up these impurities
Water vapour produces electricity in the clouds

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