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@uraan_stories_official: This Water-Powered Clock Shocked Europe in 807. In 807 CE, Caliph Harun al-Rashid sent Charlemagne an extraordinary brass water clock. When an hour was completed, a metal ball dropped onto a cymbal and produced a ringing sound. Small brass horsemen then emerged through windows as the clock marked the twelve hours. There was no electricity, modern motor, or electronic sensor. Water controlled the passage of time and activated the machine’s concealed mechanical system. The Royal Frankish Annals recorded the clock and called it a marvellous mechanical construction. The original device has disappeared, and the name of its Abbasid engineer was never preserved—but its movements were described by the people who received it. #HarunAlRashid #Charlemagne #AbbasidHistory #MedievalTechnology #HistoryTok

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Sunday 02 August 2026 15:21:21 GMT
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A stroke begins the instant blood flow to part of the brain suddenly stops. Brain cells depend on a constant supply of oxygen to produce energy. Without fresh oxygen, these cells begin to fail within seconds. The first change is a rapid drop in the energy the cells use to keep their membranes stable. When this energy disappears, the delicate balance of salt and water inside each cell becomes disrupted. Sodium and calcium begin to rush inward while potassium leaks outward. This shift causes the cells to swell and lose their ability to send normal electrical signals. As the imbalance grows, the cells release large amounts of glutamate. Glutamate is a chemical messenger that normally helps communication, but in this moment it becomes harmful because it overstimulates nearby cells. These neighboring cells also pull in too much calcium, which damages important structures inside them. Enzymes become activated at the wrong time and begin breaking down proteins and membranes. Within the first minute, the affected area of the brain becomes silent because the cells can no longer function. Although they are not dead yet, they are in a fragile state where continued oxygen loss will cause permanent injury. This early window is the beginning of the stroke process. #brain #enzymes #glutamate #viralvideo #Science #health #education #Science
A stroke begins the instant blood flow to part of the brain suddenly stops. Brain cells depend on a constant supply of oxygen to produce energy. Without fresh oxygen, these cells begin to fail within seconds. The first change is a rapid drop in the energy the cells use to keep their membranes stable. When this energy disappears, the delicate balance of salt and water inside each cell becomes disrupted. Sodium and calcium begin to rush inward while potassium leaks outward. This shift causes the cells to swell and lose their ability to send normal electrical signals. As the imbalance grows, the cells release large amounts of glutamate. Glutamate is a chemical messenger that normally helps communication, but in this moment it becomes harmful because it overstimulates nearby cells. These neighboring cells also pull in too much calcium, which damages important structures inside them. Enzymes become activated at the wrong time and begin breaking down proteins and membranes. Within the first minute, the affected area of the brain becomes silent because the cells can no longer function. Although they are not dead yet, they are in a fragile state where continued oxygen loss will cause permanent injury. This early window is the beginning of the stroke process. #brain #enzymes #glutamate #viralvideo #Science #health #education #Science

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