A 7 year old Science Boy brilliantly explains string theory using an apple! In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory describes how these strings propagate through space and interact with each other.  String theory is a broad and varied subject that attempts to address a number of deep questions of fundamental physics.  

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https://youtu.be/7ufPPy9_tIA