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What Makes a Tumor Cell Metastatic?

The cells that spread cancer throughout the body have distinctive molecular traits. Already cancer researchers know enough about those traits to convert malignant cells into benign ones

By Lea Eisenbach and Michael Feldman

The Electrification of Thunderstorms

Although it has been known for two centuries that lightning is a form of electricity, the exact microphysical processes responsible for the charging of storm clouds remain in dispute

By Earle R. Williams

Superfluid Turbulence

Liquid helium cooled to within 2.172 degrees of absolute zero can flow without viscosity or friction, but seldom without turbulence. The odd form of turbulence that arises is quantum-mechanical in nature

By Russell J. Donnelly

Obstacles to Developing Vaccines for the Third World

Six vaccines are already in use there. Many others could be produced within 10 years. Yet those who have the know-how to make the needed vaccines have lacked incentives to apply it

By Anthony Robbins and Phyllis Freeman

Infrared Optical Fibers

New glass and crystalline fibers, promising greater transparency and transmitting longer wavelengths than silica fibers, have been applied to communication systems, medical diagnostics and optical-fiber lasers

By Martin G. Drexhage and Cornelius T. Moynihan

Evolution of Human Walking

Features of her pelvis show that a three-million-year-old hominid, Lucy, was as adept at upright walking as we are. Bipedality could date from the earliest phase of human evolution

By C. Owen Lovejoy

Educating Poor Minority Children

Schools must win the support of parents and learn to respond flexibly and creatively to students' needs. A successful program developed in New Haven points the way

By James P. Comer

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