Berman

For years, science fiction writers have imagined cloaking devices that could make objects or people invisible. While invisibility cloaks are still a fantasy, scientists have developed the optical materials that could some day make the illusion a reality. As VOA's Jessica Berman reports the materials, which bend light, have more serious applications as well.

The blood-brain barrier is a natural defense system that prevents harmful substances in the blood from entering the brain. VOA’s Jessica Berman reports doctors may have found a way to get past the barrier to treat cancer patients.

Researchers say they have the first evidence that climate in Africa is influenced by conditions in the northern hemisphere, a finding that contradicts the main theory about climate in the subtropics. As VOA's Jessica Berman reports scientists say the discovery will help them make future climate predictions.