Nuclear Power, Nuclear Weapons and International Stability
Irresolution over domestic energy policy and the role of nuclear power may act to undermine current U.S efforts to control the proliferation of nuclear weapons
Volume 238, Issue 4
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Features
Microvascular Surgery for Stroke
An operation to increase cerebral blood flow by joining an artery in the scalp to one on the surface of the brain is made possible by new technology: an operating microscope and microinstruments
The Tracks of Moving Cells
Migrating tissue cells will remove particles of gold from a particle-coated substrate, creating a graphic record of their movements that reveals a surprising degree of order
The Food-sharing Behavior of Protohuman Hominids
Excavations at two-million-year-old sites in East Africa offer new insights into human evolutionary progress by showing that early erect-standing hominids made tools and carried food to a home base
The Birth of Massive Stars
The birth of stars many times hotter and more massive than the sun may be triggered by shock waves traveling through large cool clouds of interstellar gas and dust
Kimberlite Pipes
These remarkable fossil volcanoes rise from a great depth. They are the ultimate source of diamonds and also of rocks that may be specimens of materials from the earth's mantle
Insects of the Water Surface
The attractive force between water molecules creates an elastic film at the surface of a calm body of water. All over the world the same four types of insects are found on or near this unusual environment
Atmospheric Halos
Rings around the sun and moon and related apparitions in the sky are caused by myriad crystals of ice. Precisely how they are formed is still a challenge to modern physics