大象传媒

Scientists have succeeded in culturing embryonic stem cells, a breakthrough for transplant medicine that poses ethical and, in some countries, legal problems. NASA is developing an alternative method of launching rockets into space, based on electro-magnetic propulsion. Dire predictions about the future of the world's climate. A new treatment for fabrics that repels dirt and reduces air resistance. The discovery of a bird fossil suggests that dinosaurs and parrots keep each other company.