Science Frontiers ONLINE No. 20: Mar-Apr 1982

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Archaeology

• A Recently Discovered "book" of Petroglyphs

Astronomy

• A Big Void in Space Or A Defective Yardstick?
• Something Hot Beneath Small Saturn-satellite Surfaces
• A Couple Venusian Curiosities

Biology

• Heads Or Tails?
• A Tale of Two Ecosystems -- or Maybe Many More
• Missing Links: the Big Ones Still Elude Us
• Puzzling Group Behavior of Sharks

Geology

• Gravity Anomaly Ripples Centered in Canada
• Subterranean Petroleum Factories?

Geophysics

• A Most Peculiar Cloud Arch
• Whirling Crescents Move with Ship

Psychology

• The Mystery of Spontaneous Visions