Number 51 (Story #4), October 10, 1991 by Phillip F. Schewe and Ben Stein GREENLANDISH MUONS suggest the feasibility of using the Antarctic ice mass as a neutrino telescope. A Berkeley-Irvine-Wisconsin collaboration has observed Cerenkov light from secondary muons---presumably formed when high-energy (1 TeV or more) neutrinos interact with atoms inside the earth---in phototubes placed 217 m below the Greenland ice sheet. They regard the observed muon detection rate as evidence that ice is sufficiently transparent to Cerenkov light and that therefore an even more ambitious arrangement located at the South Pole, and referred to as the Antarctic Muon and Neutrino Detector Array, would succeed in locating astrophysical neutrino sources with fairly good angular resolution (one degree). AMANDA, not to be confused with the DUMAND neutrino detector being built on the ocean floor near Hawaii, would employ strings of phototubes lowered 1 km down holes drilled into the Antarctic ice. (Nature, 26 Sept. 1991.)