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

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat

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