In sixteenth-century England, Richard Mulcaster, a humanist educator, argued that laughter produced warmth throughout the body, and was a good antidote for colds, headaches, and bouts of melancholy.
Thus, to quote one of Husserl's examples, "I see coal as heating material; I recognize it and recognize it as useful and as used for heating, as appropriate for and as destined to produce warmth.
The floors are covered in wide planked oak, unusual in an Israeli apartment, but producing a warmth that is not available from the more common tiled floors.
Another option for efficient warmth is called a ground-source heat pump, which, Mr. Peterson said, "is nothing more than an air-conditioning unit that runs in reverse to produce heat, and runs the process the other way to produce A.C".
When the heat pump can no longer produce adequate warmth, a "strip heating" system inside the unit turns on.
A small body like Enceladus would be unlikely to hold enough radioactive elements to produce continuing warmth.
This produces a warmth of human relationships which may strike those who have had some experience with such groups as an almost physical phenomenon".
"If being in a hospital bed made a difference," he said, "it was mostly the difference produced by warmth, shelter, and food, and attentive, friendly care, and the matchless skill of the nurses in providing these things.
David J. Stevenson, a professor of planetary science at the California Institute of Technology, speculates that the decay of radioactive elements within some of these worlds, known as Kuiper Belt Objects, would produce enough warmth to melt a mixture of water ice and ammonia, an antifreeze.
