Jeff Hamburg (born 1956) is an American composer.
 Born in Philadelphia, he studied acoustics and composition at the University of Illinois and moved to the Netherlands in 1978 to continue his studies at the Royal Conservatory of The Hague with Louis Andriessen.
 In 1986, he received the Conservatory Prize.
 He further studied French Horn at the Royal Conservatory and later conducted classes with David Porcelijn at the Conservatory of Utrecht.
David Roderick (born 1970) is an award-winning American poet from Plymouth Massachusetts, who is an Assistant Professor at the University of North Carolina at Greensboro.
 Previously, he lectured at the University of North Carolina, Chapel Hill as the Kenan Visiting Writer, at the The University of San Francisco and at Stanford University, where he also conducted classes for its EPGY summer program.
Surveillance Art is the use of technology intended to record human behavior in a way that offers commentary on the process of surveillance or the technology used to surveil.
 Surveillance Art manifests itself in many different forms, from short films to architecture, but all have been shown to provide some type of critical response to the rise of surveillance by various authorities and the technology used to achieve it, especially when dealing with issues of security and enforcing laws.
Assisted reproductive technology (ART) is the technology used to achieve pregnancy in procedures such as fertility medication, in vitro fertilization and surrogacy.
 It is reproductive technology used primarily for infertility treatments, and is also known as fertility treatment.
 It mainly belongs to the field of reproductive endocrinology and infertility, and may also include intracytoplasmic sperm injection (ICSI) and cryopreservation.
 Some forms of ART are also used with regard to fertile couples for genetic reasons (preimplantation genetic diagnosis).
 ART is also used for couples who are discordant for certain communicable diseases; for example, HIV to reduce the risk of infection when a pregnancy is desired.
Professional Disc (PFD) is a digital recording optical disc format introduced by Sony in 2003 primarily for XDCAM, its new tapeless camcorder system.
 It was one of the first optical formats to utilize blue laser, which allowed for higher density of data to be stored on optical media compared to infrared laser technology used in the CD and red laser technology used in the DVD format.
School of the Air is a generic term for correspondence schools catering for the primary and early secondary education of children in remote and outback Australia where some or all classes were traditionally conducted by radio, although this is now being replaced by internet technology.
 In these areas, the school-age population is too small for a conventional school to be viable.
Adelaide Laetitia "Addie" Miethke, {'1': ", '2': ", '3': ", '4': "} (8 June 1881 – 4 February 1962), was a South Australian educator and teacher who was pivotal in the formation of the School of the Air using the existing Royal Flying Doctor Service radio network.
Parameshwara College (Tamil: பரமேஸ்வரா கல்லூரி "Paramēsvarā Kallūri") was one of the first Hindu schools in Ceylon (now Sri Lanka).
 It was founded by Sir P. Ramanathan in 1921.
 His idea was to make the school a university.
 It began as a teacher training school and later conducted classes for the London Matriculation and Cambridge exams.
 Later, it followed the S.S.C. Exam and University Entrance syllabus.
 This school was built on 36 acre of land with room for expansion; later a Sivan temple was built on the school compound for prayers.
 The school premises were taken over by the government in 1974 to make way for the newly created Jaffna Campus of the University of Sri Lanka (later University of Jaffna).
 The students and teachers who were attending the school were sent to nearby schools.
 The old building is still there as the entrance to the University of Jaffna.
Philip J. “P.J.” Crowley (born July 28, 1951) is the former United States Assistant Secretary of State for Public Affairs, having been sworn into office on May 26, 2009.
 He resigned on March 13, 2011, following comments he made about the treatment of Chelsea (formerly Bradley) Manning.
 Crowley was named the 2011-2012 recipient of the General Omar N. Bradley Chair in Strategic Leadership, a joint initiative among the United States Army War College, Dickinson College and the Pennsylvania State University – Dickinson School of Law.
 While in residence, Crowley conducted classes at the three institutions.
 He is currently teaching at George Washington University and is affiliated with the university's Institute for Public Diplomacy and Global Communication.
Computers in the classroom include any digital technology used to enhance, supplement, or replace a traditional educational curriculum.
 As computers have become more accessible, inexpensive, and powerful, the demand for this technology has increased, leading to more frequent use of computer resources within classes, and a decrease in the student-to-computer ratio within schools.

Question: What technology used to be how the school that Adelaide Miethke conducted classes?
Answer: radio