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- Day50 - Easy Level" 【출처】 BBC Learning - How Semiconductors Changed the World & TED-Ed Videos Before semiconductors existed, people used vacuum tubes to control electricity like water pipes controlling water flow.
- Day59 【제목】 "Atoms and Electrons Basics - Easy Level" 【출처】 Khan Academy Physics & BBC Bitesize Science Everything around us - people, rocks, water, air - is made from tiny building blocks called atoms.