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YouTubeKF Labs
102-Year-Old Electrical Tech Still Glows Inside an Elevator ⚡🔵
Inside this 102-year-old elevator control cabinet sits a glowing relic of early electrical engineering: a mercury arc rectifier. This device was built to convert alternating current (AC) into direct current (DC) using a pool of liquid mercury and an arc discharge — long before modern semiconductors existed. Invented in the early 1900s ...
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The Moment of History on Instagram: "In 1986, Queen performed their last concert with Freddie Mercury. The show took place at Knebworth House, a private English country estate. The performance was held on August 9th. More than 120,000 people came to see Freddie and hear Queen live. None of the audience knew that they were witnessing Freddie’s final live performance."
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