Quantum tunneling is a phenomenon in which particles pass through barriers that would be impossible to cross according to classical physics.

In quantum mechanics, particles are described by wave-like probabilities rather than precise locations. Because of this, there is always a chance that a particle can be found on the other side of a barrier, even if it does not have enough energy to overcome it.

Quantum tunneling is essential to many natural and technological processes. It helps power the nuclear fusion occurring inside stars and is used in devices such as semiconductors and scanning tunneling microscopes.

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