Phát điện
Một nhà vật lý đang giải thích thí nghiệm của mình cho một cô gái: - Sự cọ xát có thể sinh ra điện, ví dụ khi cô vuốt ve một con mèo trong bóng tối, cô sẽ nhìn thấy những tia sáng phát ra...
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