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The Mars Pathfinder Mission

Last summer the first ever Mars rover found in situ evidence that the Red Planet may once have been hospitable to life

By Matthew P. Golombek

The Split Brain Revisited

Groundbreaking work that began more than a quarter of a century ago has led to ongoing insights about brain organization and consciousness

By Michael S. Gazzaniga

The Single-Atom Laser

A new type of laser that harnesses the energy of individual atoms reveals how light interacts with matter

By Michael S. Feld and Kyungwon An

Mating Strategies in Butterflies

Butterflies meet, woo and win their mates using seductive signals and clever strategies honed by evolution

By Ronald L. Rutowski

Léon Foucault

Celebrated for his pendulum experiment in 1851, Foucault also produced decisive evidence against the particle theory of light, invented the gyroscope, perfected the reflecting telescope and measured the sun's distance

By William Tobin

HIV 1998: The Global Picture

Worldwide, the populations most affected by the AIDS virus are often the least empowered to confront it effectively

By Jonathan M. Mann and Daniel J. M. Tarantola

Improving HIV Therapy

Today's optimal treatments can work magic, but they are costly and onerous and do not work for everyone. What might the future bring?

By John G. Bartlett and Richard D. Moore

When Children Harbor HIV

HIV infection is particularly difficult to combat in the young

By Catherine M. Wilfert and Ross E. McKinney

Preventing HIV Infection

Altering behavior is still the primary way to control the epidemic

By Thomas J. Coates and Chris Collins

HIV Vaccines: Prospects and Challenges

Unlike vaccines for many viruses, those for HIV may have to go beyond generating antibodies. Devising approaches that will fully activate the immune system is far from simple

By David Baltimore and Carole Heilman


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