Primary colors are not a fundamental property of light but are related to the color vision system in animals. The human eye normally contains only three types of color photoreceptors (L, M and S) that are associated with specialized cone cells.
No. 15; Updated October 2015. Approximately 120,000 children are adopted each year in the United States. Children with physical, developmental, or emotional handicaps who were once considered difficult to place with a new family are now being adopted (special needs adoptions). Adoption helps many of these children to grow up in permanent families rather than in foster homes or institutions.
Children and youth enter foster care through no fault of their own, because they have been abused, neglected, or abandoned and are unable to continue living safely with their families. According to the most recent federal data, there are currently more than 400,000 children in foster care in the United States.