Best xkcd comic not shown on xkcd

This was drawn for The New Yorker's Cartoon-Off
I loved this one. In fact this is the best one I have seen recently(like the past 6 months).

Higher dimensional string as a 1 dimensional string in higher dimensional space?
That's what I thought. Correct me if I'm wrong.
2 dimensional manifolds can knot in 4 dimensional space right?

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