http://www.directorydallas.com/templates/Default/img/logo.gifhttp://www.directorydallas.com/http://www.directorydallas.com/science-and-environment/http://www.directorydallas.com/science-and-environment/Dallas-Master-Gardeners-l100683.htmlIncludes contacts, newsletters, and gardening resources.http://www.directorydallas.com/science-and-environment/Dallas-Regional-Science-and-Engineering-Fair-l100685.htmlOne of the largest regional student fairs in the United Stateshttp://www.directorydallas.com/science-and-environment/Dallas-Zoo-l100687.html8000 animals on 97 acres. Includes children's zoo. General information, zoo map, exhibit overview, class summary, special events, and conservation information.http://www.directorydallas.com/science-and-environment/North-Texas-Clean-Air-Coalition-l100688.htmlPromote voluntary actions to help improve air quality in the North Texas Region. Features news, air pollution watch or warning status, and contact information.http://www.directorydallas.com/science-and-environment/Texas-Astronomical-Society-l100689.htmlSociety chartered in 1955 to promote the study of astronomy and related fields and to pursue observation and construction of instruments as a hobby.http://www.directorydallas.com/science-and-environment/Texas-Discovery-Gardens-l100691.htmlFeatures acres of native and adapted plants. Also provides educational programs and activities including programs for school and youth groups, a butterfly habitat program, adult workshops, and free concerts.http://www.directorydallas.com/science-and-environment/The-Dallas-Arboretum-and-Botanical-Garden-l100695.htmlFeatures landscaped acres of trees, gardens, and lawns, with fountains, sculptures, and historic mansions. Site includes membership information, photos of each garden, and information about educational programs.