To the best of our knowledge, we humans can only experience this world in three spatial dimensions (plus one time dimension): up and down, left and right, and forward and backward. But in two physics ...

Greene offers up a garden hose as a good example of what the fourth dimension looks like. From far away, this garden hose may look one-dimensional to the naked eye. From a distance, we simply can’t ...

Try picturing a fourth dimension. Take a few steps forward. Veer left for a second dimension, then jump up for a third dimension. Then dive off into a fourth dimension, somewhere, somehow, in a ...