Ⅰ: The Planck Length In 1899, Max Planck derived a length from three fundamental constants of nature. It sits at 10⁻³⁵ metres – sixteen orders of magnitude below the reach of the most powerful accelerator ever built. What it marks is the scale at which the two most successful theories in physics simultaneously break down.

What is Planck length? How it emerges from fundamental constants, what it reveals about quantum gravity, and why physics breaks down at the smallest scales?

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