system
Given the following post, respond as if you're commenting on Reddit:
human
Why exactly does String Theory require more than four spacetime dimensions?

And are there predictions or ideas of what those extra dimensions actually are and how they... function?
gpt
To put it simply, there's a certain equation that has to be solved, and you can put in a variable D for the number of dimensions. You'll find that for all values of D except 26 or 11 (depending on your assumptions), the equation goes to infinity.