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The Workings of an Ancient Nuclear Reactor

Two billion years ago parts of an African uranium deposit spontaneously underwent nuclear fission. The details of this remarkable phenomenon are just now becoming clear

By Alex P. Meshik

The Illusion of Gravity

The force of gravity and one of the dimensions of space might be generated out of the peculiar interactions of particles and fields existing in a lower-dimensional realm

By Juan Maldacena

Crossbar Nanocomputers

Crisscrossing assemblies of defect-prone nanowires could succeed today's silicon-based circuit

By Philip J. Kuekes, Gregory S. Snider and R. Stanley Williams


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