Body scan technology reveals male figure hidden in artwork   The
same technology used for airport body-scanning and kitchen ovens
has been adapted to reveal the secrets of artworks.  The imaging
technique is termed terahertz spectroscopy and makes use of
relatively weak electromagnetic radiation. In this instance it
was used to look beneath the surface of Trois hommes armés de
lances -- a 19th century fresco by Giampietro Campana -- to
reveal what looks like an authentic Roman fresco.  "We were
amazed, and we were delighted," said J. Bianca Jackson,
reporting on the project to the American Chemical Society. "We
could not believe our eyes as the image materialised on the
screen. Underneath the top painting of the folds of a man's
tunic, we saw an eye, a nose and then a mouth appear. We were
seeing what likely was part of an ancient Roman fresco,
thousands of years old."  Finding older images under the surface
of paintings is not uncommon as the cost of materials or simple
convenience often meant artists would