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.
As a result of these changes, the supply of new-born babies available for adoption dropped sharply. In 1979-80, when information about the ages of adoptees was first available, adopted children aged under one year represented 81% of all adoptions of Australian-born children by non-relatives.