Science News

A radio telescope has detected hundreds of hydrogen clouds in the gaseous halo that surrounds the disk of our galaxy. This previously unknown population may have been lofted into the halo by a galactic fountain--powerful winds from supernova explosions...

Once considered a waste product of birth, umbilical cord blood is now prized as a source of stem cells that can replace the diseased bone marrow of people with leukemia and other illnesses. Unfortunately, umbilical cords often don't contain enough...

Most Mediterranean countries aren't big polluters. A new survey suggests, however, that the area is a crossroads for pollution-carrying air currents from Europe, Asia, and North America. According to an international team of 31 atmospheric chemists,...

Prime numbers lie at the core of some of the oldest and most perplexing questions in mathematics. Evenly divisible only by themselves and 1, they are the building blocks of integers. In recent decades, prime numbers have emerged from their starring...

A leaf turning red in the fall makes for a much greater mystery than a leaf turning yellow does. The yellowing signals simply a dropping of veils because the yellow pigment has lain hidden in the leaf during its long, green summer. When summer ends...