What is Quantum Tunneling?
Imagine a ball rolling up a hill. Classically, if it doesn't have enough energy to reach the top, it rolls back down. But in the strange world of quantum mechanics, tiny particles like electrons or protons can sometimes "tunnel" through the hill, even without enough energy! This amazing phenomenon, called **quantum tunneling**, is a core concept in quantum physics. It's like a ghost passing through a wall, and it happens because particles also behave like waves (wave-particle duality).