Common Birds: Black and White or Gray and White Birds. Dark-eyed Junco: 5 1/2 to 6 3/4  in size. Juncos are small, dark gray birds with white bellies. Juncos look different in different regions of the United States. In the East, Juncos are dark gray with white underparts and white outer tail feathers.
The European Spallation Source (ESS) is a multi-disciplinary research facility based on what will be the world's most powerful neutron source. It is currently under construction in Lund, Sweden. At least 17 European countries will act as partners in the construction and operation of ESS.
Earth System Science. In the phrase Earth system science (ESS), the key term is system.. A system is a collection of interdependent parts enclosed within a defined boundary. Within the boundary of the earth is a collection of four interdependent parts called spheres..