As far as we know for certain, we live in a world with three spatial dimensions (length, width and depth) and one dimension of time. This means that it only takes three numbers to determine our physical location, which on Earth breaks down to longitude, latitude and altitude/depth. Time naturally comes into play by identifying when we're at that particular point in space. Some physicists, such as string theorists, believe that additional dimensions also exist but are folded away in each point of space and are invisible to the human eye.
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