I didn't become a physicist (that freshman physics course was the last science course that I ever took), and to this day I usually stay within three dimensions, only going to the fifth dimension in a musical sense. So when I saw this item, I was wondering what was going on.
Five-Dimensional Data Storage
A new material could eventually be used to store vast amounts of data on a disc.
Then I found the explanation:
Now researchers have for the first time demonstrated what they call a five-dimensional optical material. It can record data in three spatial dimensions and in response to different wavelengths and polarizations of laser light.
The material is being developed by researchers led by Min Gu, director of the Centre for Micro-Photonics at the Swinburne University of Technology in Victoria, Australia.
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More here.