• 321 Videos, Slides, Films

• 134 Social aspects
• 89 Science
• 61 Information society
• 60 Cyberspace
• 44 Mathematics
• 40 Study and teaching
• 40 Vocational guidance
• 35 Technology and civilization
• 31 History
• 30 Research
• 29 Technological innovations
• 28 Digital media
• 27 Industrial applications
• 27 Social change
• 26 Technological aspects
• 23 Applied mathematics
• 22 Computer networks
• 21 Business enterprises
• 21 Engineering mathematics
• 20 Telecommunication
• 18 Educational technology
• 17 Computers
• 17 Information technology
• 17 Office management

• 321 Films Media Group
• 321 Films for the Humanities & Sciences (Firm)
• 35 Video Education Australasia
• 29 Parthenon Entertainment (Firm)
• 20 Infobase
• 16 Looking Glass Pictures
• 14 Media 4 Math (Firm)
• 13 Media4Math
• 10 ABC News Productions
• 10 EBS Trust (Firm)
• 9 Electric Sky (Firm)
• 8 Meridian Education Corporation
• 6 4 Learning (Firm)
• 6 Cambridge Educational (Firm)
• 6 MacNeil/Lehrer Productions
• 6 Open University
• 6 Public Broadcasting Service (U.S.)
• 5 Carmelina Films (Firm)
• 5 TED Conferences LLC
• 4 BBC Worldwide Ltd
• 4 Canadian Broadcasting Corporation
• 4 Falling Walls Foundation
• 4 Fred Friendly Seminars (Firm)
• 4 NPO/Netherlands Public Broadcast
• 3 Agency for Instructional Technology

• 321 English
• 2 Multiple languages

• 21 United States
• 6 Africa, Sub-Saharan
• 3 China
• 3 Japan
• 2 Europe
• 2 Zambia
• 1 Developing countries
• 1 Earth (Planet)
• 1 Egypt
• 1 Former Soviet republics
• 1 Hiroshima-shi
• 1 India
• 1 Korea
• 1 Los Angeles (Calif.)
• 1 Malawi
• 1 Outer space
• 1 Tanzania

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