Number 43, August 1, 1991 by Phillip F. Schewe and Ben Stein AN ORGANIC FERROMAGNET , consisting only of light elements, has been discovered by scientists at the University of Tokyo. The new compound, p-nitrophenyl nitronyl nitroxide (abbreviated as p-NPNN, with a chemical composition of C13H16N3O4) possesses long-range ferromagnetic order below a transition temperature of 0.65 K. According to M. Takahashi et al., other claims of light-element organic ferromagnets concern materials with low magnetization or poor reproducibility. Like lightweight batteries, lightweight magnets would have numerous technological applications. (Upcoming article in Physical Review Letters.) THE RECENT SOLAR ECLIPSE has already borne fruit. For example, an infrared telescope on Mauna Kea has found (Drake Demining, NASA Goddard, 301-286-6519) that a magnesium emission line---long related to magnetic activity in the Sun's atmosphere but only poorly located in terms of altitude---originates in the upper photosphere and not in the overlying chromosphere. Other Mauna Kea astronomers (Eric Tollestrup, Harvard-Smithsonian) have recorded the first infrared picture of the eclipsed Sun. They failed to observe any sort of dust ring such as might have formed from dismembered comets or from the residue of material left over when the solar system first formed. (Science News, 27 July 1991.) STM IMAGES OF NON-CONDUCTING SURFACES , such as biological specimens, may be possible with a method in which ions, rather than tunneling electrons, flow between the STM tip and a sample covered with a thin film of water serving as the ion conductor. Jian-Yang Yuan of McGill University and Zhifeng Shao and Chao Gao of the University of Virginia believe that this approach may be preferable to previous scanned probe microscope imaging techniques for non-conducting materials since it exerts a minimal force on the specimen (unlike atomic force microscopy) and does not (as in ordinary STM) employ tunneling electrons, which would necessitate the use of a very thin sample. (Upcoming article in Physical Review Letters.) A NEUTRINO MAP OF THE SKY , cataloging for the first time celestial point sources of neutrinos, is the primary goal of the Deep Underwater Muon and Neutrino Detector, under construction on the ocean floor west of Hawaii. DUMAND, planned since 1975, consists of nine 1000-ft strings of photodetectors anchored 15,750 feet beneath the waves. This array trawls for neutrinos by looking for the characteristic Cherenkov radiation emitted in seawater by the muons created when neutrinos (from the stars) interact inside the Earth. (The New York Times, 23 July 1991.) AT THE XXII INTERNATIONAL PHYSICS OLYMPIAD , held July 1-9 in Havana, Cuba, several American students won medals, including Derrich Bass of North Miami Beach, FL who won a gold medal. Theresa Lynn of Durham, NC received the highest score among girls in the competition. A total of 149 high school students from 30 countries participated. (Contact Dr. Arthur Eisenkraft, 914-241-6043)