Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The floor and carpet are at different temperatures
The human body maintains a constant temperature
The carpet is a better conductor of heat than the stone
The stone conveys the heat away from the feet more rapidly than the carpet

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Physics
Analog synthesis refers to a technology based on

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

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