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

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

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Physics
Absolute Zero is defined as

At which the volume becomes zero
At which liquid Helium boils
The temperature at which all molecular motion ceases
At which water boils at 298K

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