Ghost temperature
My source for ghosts being extremely cold is D. A. Wright, "A Theory of Ghosts", Worm Runner's Digest 12, 95 (1971), reprinted in R. L. Weber (compiler), A Random Walk in Science (New York: Crane, Russak & Co., Inc., 1973), at pp. 112-3:
It has sometimes been thought that ghosts produce a sensation of cold in their environment. This is perhaps to be expected if they have just returned from outer space, where the temperature is believed to be about three degrees absolute (Penzias and Wilson 1965). It is less obvious why this should occur if they have been resident for some time, as in an old castle (unless, indeed, they have internal means of refrigeration, which seems unlikely, but perhaps not impossible). If the observation is correct, it implies that ghosts must have quite a high specific heat. [...] It is evidently important to obtain more reliable evidence as to the temperature and specific heat of ghosts.
Just before this, Wright suggests that ghosts scatter infrared light be re-emission at radiofrequencies. That, together with the ghosts' low temperature, must be why the infrared goggles in my dream were not sufficient.
