Science Frontiers ONLINE No. 69: May-Jun 1990

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Archaeology

• The enigmatic "mooring stones"

Astronomy

• Mystery of the missing comets
• Megawalls across the cosmos
• A TRIO OF STRANGE METEORS

Biology

• Extinction countdown
• Extinction discounted
• New species emerging?
• Don't pet your house plants!

Geology

• Deep-sixing another hypothesis?
• A CLASH OF HYPOTHESES

Geophysics

• Machine-like underground noises
• Lightning in the family

Physics

• Fracto-fusion?
• Gravity-defying gyros come down to earth
• Krypton-cluster magic numbers

General

• Spontaneous order, evolution, and life