Number 289 (Story #4), October 3, 1996 by Phillip F. Schewe and Ben Stein SOLAR NEUTRINO FLUXES VARY WITH A PERIOD OF 21.3 DAYS. This is the conclusion of Stanford scientists Peter Sturrock and Guenther Walther who examined years' of data from the Homestake (South Dakota), Kamiokande (Japan), and GALLEX (Italy) neutrino detectors. Hypothetical causes of the periodicity include the rotation of magnetic fields inside the sun or a variability in the production of neutrinos in the solar core. (Science, 20 Sept.; New Scientist, 21 Sept.)