When the renowned wizard David Copperfield passed through the Great Wall of China, we all knew that we were facing a great deception. Nothing can pass through the wall, can it? Do not rush to make decisions, it's possible in the quantum world. Think of the electron like a tennis ball, let's throw the ball towards the wall. Under normal conditions, the ball will hit the wall and come back. But there will come a moment when the ball does not come back, it passes behind the wall, it flies in space with a big speed, there is neither a crack nor a hole in the wall. This is called "tunneling" in quantum physics. This is such a "magic" event that if this event will not happen and then we could never exist. Namely; The Sun, which gives life to us, emits light and heat by the combination of two hydrogen atoms. Think of hydrogen atoms as tennis balls, they hit each other. But occasionally, two tennis balls are intertwined as a result of "quantum tunneling", in which hydrogen atoms are transformed into helium atoms. That light, which comes in your morning room and illuminates your day, reaches you at the end of such a magic show. The transistors, which are the most fundamental parts of our mobile phones and computers, also work as the result of "quantum tunneling", and the selfies you take are stored in this way.
