I don't think you should expect necessarily advanced-level discussion about alternate dimensions and string theory on a children's spinning top forum...
I saw this a very long time ago but never deigned a response. I personally like the idea of the 11-dimension idea, and the belief that we are living in a four-dimensional space according to modern physics. The technical term is that the 3 spatial dimensions and dimension of time (commonly referred to as the 4th dimension) are unified in a Minkowski continuum known as spacetime. That's heard in popular culture a lot, but usually not in the right manner.
The Minkowski space, where Einstein formulated special relativity, contrasts with normal Euclidean space, where most of the known geometry laws apply, in that it adds an extra timelike dimension. This allows objects to be 'altered' with respect to time, as seen in the rotation of a tesseract or hypercube.
You could go into gravitation and its effect on the continuum, general relativity vs. special relativity, and Lorentz transformations, but then you start going really deep and discussing pseudo-Riemann manifolds, pseudo-Euclidean spaces, and Poincaré groups and it gets extremely theoretical. It's fascinating but incredibly complex, I wrote a small and basic paper on it a few years ago but it only brushed the tip of the iceberg.
As much as I love the idea of the Minkowski continuum though, string theory is rather annoying and almost impossible to prove. It's especially bad considering that different interpretations lead to different numbers of dimensions with different alterations about them.
"In many ways, the work of a critic is easy. We risk very little, yet enjoy a position over those who offer up their work and their selves to our judgment. We thrive on negative criticism, which is fun to write and to read. But the bitter truth we critics must face, is that in the grand scheme of things, the average piece of junk is probably more meaningful than our criticism designating it so. But there are times when a critic truly risks something, and that is in the discovery and defense of the new. The world is often unkind to new talent, new creations. The new needs friends. Last night, I experienced something new: an extraordinary meal from a singularly unexpected source. To say that both the meal and its maker have challenged my preconceptions about fine cooking is a gross understatement. They have rocked me to my core. In the past, I have made no secret of my disdain for Chef Gusteau's famous motto, "Anyone can cook." But I realize, only now do I truly understand what he meant. Not everyone can become a great artist; but a great artist can come from anywhere."
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