Physics
The law of conservation of energy states that

Energy can neither be created nor destroyed
Energy can neither be created or destroyed
Energy can either be created nor destroyed
Energy can either be created or destroyed

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

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