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O-JD: polarised_light
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O-JD: Massive_crowd_NSD
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O-JD: Mg_burning_dry_ice
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O-JD: Open_Day_auditorium
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O-JD: Flame_tests
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O-JD: total_internal_reflection_demo
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O-JD: LN2_superconductor_Meissner
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O-JD: experiments_surface_tension
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O-JD: ingredient_simple_motor_building
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O-JD: non-newtonian_fluid_cornflour_mess
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O-JD: science_for_the_young
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O-JD: chemiluminescence_demo
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O-JD: Arnab_C&W
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O-JD: Shiraz_Minwalla_C&W_1
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O-JD: Shiraz_Minwalla_C&W_2