• 115 Videos, Slides, Films

• 27 Science
• 23 Educational technology
• 22 Mathematics
• 19 Engineering mathematics
• 18 Vocational guidance
• 16 History
• 15 Mass media
• 15 Technological innovations
• 14 Industrial applications
• 12 Communication
• 12 Environmental sciences
• 11 Digital media
• 11 Internet
• 10 Computers
• 10 Geometry
• 9 Computer networks
• 9 Design
• 9 Information technology
• 9 Telecommunication
• 8 Cyberspace
• 8 Education
• 8 Social aspects
• 7 Electricity

• 61 Films Media Group
• 48 Films for the Humanities & Sciences (Firm)
• 47 Alexander Street Press
• 21 Infobase
• 13 Media4Math
• 9 Real Life Productions
• 7 Available Light Productions
• 6 4 Learning (Firm)
• 6 Public Broadcasting Service (U.S.)
• 5 Brook Lapping Productions
• 5 Glasshead Television and Web
• 4 Big Heart Media
• 4 Intelligence Squared US (Firm)
• 4 Media 4 Math (Firm)
• 4 PERC SM21 (2021)
• 4 Video Education Australasia
• 3 AAPT SM21 (2021)
• 3 Illumina Digital
• 2 Cambridge Educational (Firm)
• 2 Cornucopia Productions Ltd
• 2 Double Exposure (Firm)
• 2 Flashback Television (Firm)
• 2 Glasshead Productions
• 2 Home Box Office (Firm)
• 2 Independent Television News Limited

• 114 English
• 1 Multiple languages
• 1 Unknown

• 45 Great Britain
• 3 United States
• 1 China
• 1 U.S. states

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