Okay, here's the thing. There is no fourth dimension. Mind not blown by that? How about this - there is no third dimension either. Before you start yelling at your smartphone about how the Universe is made up of three dimensions, just settle down and let the episode of MinutePhysics below explain this rather tricky misconception.
Anyone with a basic understanding of dimensions could tell you that an object with height, width, and depth is three-dimensional, and something with height, width, but no depth - say a drawing on a piece of paper - is two-dimensional.
Just because there are four dimensions doesn't mean there's a "fourth dimension". Learn more in the video below:
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