We have sensory nerve endings in the dermis (the layer between epidermis
and hypodermis) that respond to "hot" and others that respond to "cold".
"Hot" and "cold" are defined by the sensory mechanisms. The parts of the
brain which interpret the signals from these nerves at a low level aren't
aware that "hot" and "cold" are actually parts of the same continuum.

-- Jeff, in Minneapolis

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http://www.FreeMars.org/jeff/

"I find astronomy very interesting, but I wouldn't if I thought we
were just going to sit here and look." -- "Van Rijn"

"The other planets? Well, they just happen to be there, but the
point of rockets is to explore them!" -- Kai Yeves