SCIENCE | HISTORY | FACTS | EXPERIMENT on Instagram: "At first glance, this looks like a visual illusion — but it’s actually pure physics and human perception working together. When an object spins fast enough, our eyes and brain stop seeing individual positions and start seeing an average shape. 1️⃣ Persistence of Vision: Your eyes retain images for a fraction of a second. When something spins rapidly, those images overlap, creating a smooth, continuous form instead of separate frames. 2️⃣ Moti

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SCIENCE | HISTORY | FACTS | EXPERIMENT on Instagram: "Sandbags are critical during floods, construction, and emergency situations, but filling them by hand is slow and exhausting. This video shows a smart, efficient on-site method that saves time, labor, and energy. 1️⃣ Gravity-Based Filling: Instead of shovels, workers use a hopper or chute system that lets sand flow directly into bags using gravity. This drastically speeds up the process. ⏱️ 2️⃣ Consistent Volume: Each bag receives a uniform a