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Can Gravity Be Quantum? New Study Challenge Feynman's Iconic Experiment Intro The century-long struggle to unite gravity and quantum theory — two pillars of modern physics — has just taken a surprising turn. A new Nature study questions one of the most promising experimental paths toward quantum gravity , arguing that classical gravity could also mimic the quantum entanglement effect once thought unique to the quantum world. For more on physics breakthroughs, explore FSNews365 Science & Space for in-depth reports. The Century-Old Quest for a Unified Theory Physicist have long dreamed of unifying the four fundamental forces — gravity , electromagnetism, the strong force and the weak force — under one grand quantum framework. While electromagnetism and the nuclear forces fit neatly within quantum mechanics, gravity stubbornly resists integration. The key obstacle lies in scale: quantum mechanics dominates the microscopic realm of particles , whereas gravity govern the macrosco...