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RD is a well-recognized term , protected from use by unqualified practitioners . Cannabis sativa is one of the most widely used psychoactives and has a documented history of use going back thousands of years ; however , the mechanisms of its actions are only just being elucidated . Myasthenia gravis causes muscle weakness that is worsened by use and improved with rest . If all halogen torchieres in use were replaced by the compact fluorescent bulb , Levine noted , the energy savings would be 35 terawatt-hours - - or some $ 2 billion a year . The intent of use is to equip the novice teacher with sound , practical ideas to incorporate into designing lessons and to perhaps provide a seasoned teacher with new formatting for an instructional idea . One way to facilitate ease of use is to provide a shared memory programming model with a single flat address space for all processors . While this diversity of use is valued as support for experimentation , there is no established way to assess and report the effectiveness of student learning associated with the application of instructional technology . Unfortunately the current level of web technology is such that artistic creations on the World Wide Web are virtually unprotected from use by others .