What is This Thing on the Roof of Factory? | WORLD UNSEEN |

फैक्ट्री की छत पर लगा ये घूमने वाला उपकरण आखिर क्यों होता है? 🤔 Have you ever noticed these spinning ventilators on factory roofs? 😱 In this video, WORLD UNSEEN explains what they are, how they work, and why factories use them. 🌍 Discover strange, useful and amazing things from around the world with WORLD UNSEEN. Watch till the end! 👀🔥 #worldunseen #facts #amazingfacts #interestingfacts #science #technology #factory #ventilator #didyouknow #knowledge #world #lykstage