harry

Yes there is! It was discovered more than 200 years ago that radiant cold could be reflected and focused like radiant heat using parabolic mirrors. See the1985 paper in the American Journal Physics for some history behind this simple and important experiment: http://www2.ups.edu/...0experiment.pdf The experiment is hardly known today, and has never been analzyed and explained in a QUANTITATIVE fashion using modern heat theory. While a qualitative explanation in terms of modern heat theory is given at the end of this paper I have a hunch the observed RATE of cooling is faster than you would expect with modern heat theory. I also suggest you read the book _Inventing Temperature_ by Chang c. 2004. Available as a printed book from Amazon or as a pdf file: http://bib.tiera.ru/...29%28286%29.pdf Harry