If a tree falls in the forest and there's no one around to hear it, does it make a sound? The obvious answer is yes—a tree falling makes a sound whether or not we hear it—but certain experts in quantum mechanics argue that without an observer, all possible realities exist. That means that the tree both falls and doesn't fall, makes a sound and is silent, and all other possibilities therein. This was the crux of the debate between Niels Bohr and Albert Einstein. Learn more about it in the video below.
Quantum Entanglement And The Bohr-Einstein Debate
Does reality exist when we're not watching?
The Double Slit Experiment
Learn about one of the most famous experiments in quantum physics.
An Illustrated Lesson In Quantum Entanglement
Delve into this heavy topic with some light animation.
Written by Curiosity Staff September 30, 2016
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