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Now some fresh pickings from the Political Grapevine: Difference of Opinion One of the world’s leading polar bear experts has been told to stay away from an international conference on the animals because his views are “extremely unhelpful,” according to an e-mail by the chairman of the Polar Bear Specialist …

A dollar a day keeps the babies away. That’s the incentive behind College Bound Sisters, a program at the University of North Carolina at Greensboro that aims to keep 12- to 18-year-old girls in school and baby-free. Girls in the program attend 90-minute meetings every week at which they receive …

Spacecraft have used ion drives to explore the moon and deep space, but a new study aims to boost the electric propulsion idea to keep satellites around Earth alive longer. Researchers are working to develop new ion thrusters that can harvest vital electrons from electrified carbon nanotubes, rather than from …