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And there was always a worry in those environments that someone would be hurt . For example , the preprocessor token GL_EXT_texture3D is defined in compile environments that export the 3D texture extension command and enumerants . In March 1996 , the library opened in its main building the Community Technology Center , a public computer laboratory with dual PC and Mac environments that offers a training center , a software preview center , and public access work stations . I believe seasonal work is almost necessary to do in your older teens / early twenties in order to grow as a person in an environment that is safe , yet freedom encouraging . You have the security most Linux users enjoy , i.e. no spyware / adware / viruses , yet you get the ease of user and friendly environment that Windows users enjoy . Good design principles will do more in achieving a believable environment that your players will relate to and feel comfortable in . The department is committed to creating and maintaining workplace arrangements and work environments that ensure the health , welfare and safety of all its employees . The vast majority of these animals live a kind of subsistence life , merely surviving in captive environments that cannot provide for their biological or behavioral needs . " I lived and worked in the planned town of Columbia , Maryland , which was an example of an environment that did not always work the way planners thought it would .