• 34 Videos, Slides, Films

• 27 Physics
• 16 Discoveries in science
• 16 History
• 12 Research
• 12 Study and teaching
• 10 Cosmology
• 8 Chemical elements
• 8 Chemistry, Physical and theoretical
• 8 Inorganic compounds
• 8 Organic compounds
• 5 Heat
• 5 Heat-engines
• 5 Thermodynamics
• 4 Dynamics
• 4 Mechanics
• 3 Chemistry
• 2 Biology
• 2 Chemical bonds
• 2 Energy consumption
• 2 Energy development
• 2 Environmental aspects
• 2 Galaxies
• 2 Management
• 2 Mathematics

• 33 Films Media Group
• 20 Films for the Humanities & Sciences (Firm)
• 10 Annenberg Learner (Firm)
• 7 Video Education Australasia
• 4 La Compagnie des Taxi-Brousse
• 3 BBC Worldwide Ltd
• 3 Cambridge Educational (Firm)
• 2 Public Broadcasting Service (U.S.)
• 1 Canadian Broadcasting Corporation
• 1 China Aerospace Studies Institute (U.S.)
• 1 Ethical Markets Media
• 1 Mulvaney, Brendan
• 1 Nobel Media AB (Firm)
• 1 TVF International (Firm)

• 34 English

• 2 Outer space
• 1 China
• 1 Earth (Planet)
• 1 United States

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