If a tree falls in the forrest and no one is there to hear it, does it make a sound?

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"If a tree falls in a forest and no one is there to hear it, does it make a sound? Perhaps not, some say.
And if someone is there to hear it? If you think that means it obviously did make a sound, you might need to revise that opinion."

"in quantum mechanics – one of our two most fundamental scientific theories, together with Einstein's theory of relativity – that throws doubt on some common-sense ideas about physical reality."


When someone observes an event happening, it really happened.
It is possible to make free choices, or at least, statistically random choices.
A choice made in one place can't instantly affect a distant event. (Physicists call this "locality".)

Quantum mechanics works extremely well to describe the behaviour of tiny objects, such as atoms or particles of light (photons). But that behaviour is … very odd.
In many cases, quantum theory doesn't give definite answers to questions such as "where is this particle right now?" Instead, it only provides probabilities for where the particle might be found when it is observed.

Now I have always had an interest in the quantum world but I freely admit to struggling with understanding it's weird revelations. Thought you guys may enjoy this article.