Number 8 (Story #4), November 12, 1990 by Phillip F. Schewe and Ben Stein ACOUSTIC MEASUREMENTS OF OCEAN TEMPERATURES may contribute to the study of greenhouse effects. Scientists at Heard Island, 2550 miles southwest of Australia plan to place low-frequency loudspeakers underwater and microphones at many locations in other parts of the world. Since the speed of sound through seawater depends on water temperature, the measurement of transit times can be used to calculate water temperatures. Future studies may last five to ten years each, and would aid in measuring global temperature trends. (The New York Times, November 6.)