Multiscreen lesson physics teacher pupil corona discharge coronal glow lamp electric tester professor physics university math chalkboard male young scientist exam school green formula business study lecturer thoughtful subject instructor people intelligent caucasian idea portrait learn scientific examinations training look solution science thinking blue student person teach sight education knowledge answer clever lecture conceptual man machine bulb abstract conductor crystal data digital effect electricity energy fortune high illusion intensity interchange light lightning low macro magnet object power powerful risk round science teller trick voltage collage
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