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Louis de Broglie proposed that all things are waves, but this does not diminish the importance of particle behavior. The wave-particle duality indicates that everything can be described as both a wave and a particle. Based on Niels Bohr's Complementarity Principle, Werner Heisenberg sought to describe the wave-particle mathematically, resulting in the Uncertainty Principle. Heisenberg used the phenomenon of beats, where the sum of two or more waves creates wave packets. Using the Fourier transform, he developed a mathematical description of a localized wave that represented the particle and its approximate position. The Uncertainty Principle states that the uncertainty of position multiplied by the uncertainty of momentum is always greater than or equal to h/4π (Planck's constant divided by 4π). This implies that if the uncertainty of one piece of information decreases, the other must increase, making it impossible to know precisely the position and velocity of a quantum particle at the same time. This limitation is not due to the tools, but rather to nature itself. Quantum mechanics advanced despite this discovery, seeking alternatives to continue development.