Institutions including science centers, discovery centers and science/technology museums that develop and maintain permanent and/or traveling educational exhibits which illustrate principles from mathematics and the physical sciences including physics, chemistry, astronomy, telecommunications and related fields or demonstrate technological advances in areas such as robotics or computer science. Exhibits may document specific achievements such as the exploration of space; illustrate a particular natural phenomenon such as the refraction of light; demonstrate inertia, momentum, friction and other basic principles of physics; explain the theory of probability; show specific examples of technological development such as the telephone or solar heating; or demonstrate new technologies such as the use of accelerators to explore the basic components or nature or laser light as a tool in applications ranging from medical science to national defense. Many of these museums provide special programs and interactive exhibits that are designed for children of different ages.