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Reports that the presence of a species of New Zealand snails in Yellowstone National Park is worrying scientists. Ability of snails to multiply rapidly and clog irrigation pipes; Listing of five native snail species as endangered.

Reports on David Foote, a National Biological Service entomologist's effort to attract fruit flies. Reason; Comments from David, and Hampton L. Carson, a professor of genetics at the University of Hawaii; Different types of fruit flies; Description of his efforts; Problems of many indicator species.

Reports that with the first of an international armada of Mars-bound spacecraft scheduled for 1996, scientists are trying to determine how to deter a Martian invader. National Aeronautics and Space Administration's (NASA) inquiry into the hazards of interplanetary infection and prevention; Why NASA imposed strict cleaning standards on the Viking landers that landed in Mars in 1976; Comments from Michael A. Meyer of NASA.

Talks about Project Deep Probe launched in US to draw map of the earth's mantle from Canada to New Mexico. Focus on the technique of explosions used by researchers; Outcome of researches at various places.

Features Hawaii Volcanoes National Park in Hawaii. Attractions; Location; Sceneries; Accommodations; Contact information. INSET: Hot footing in volcano parks, by M.M..

Focuses on some of the work done by Roderick `Rick' Hutchinson at Yellowstone National Park in Wyoming. Description of Hutchinson's commitment to tracking the activity of the geysers and myriad hot springs in the park; Who will continue the scientific work left behind by Hutchinson, who died with geologist Diane Dustman, in an avalanche.

Presents information on Beartooth Mountains, Montana. Who cleans the Beartooth Highway; When the highway is closed; Information on a hike to the mountains. INSET: Beartooth background..