I was wondering how a string could be a one dimensional vibrationg loop? I am still trying to remove myself from the 3 dimensional ideal of our world, however how can anything have only one dimension, for then it would imply that it has neither of the other two dimensions and therefore wouldn't exist. That would be if it was "matter" as we usually think of it. But both point particles and strings are "before matter", so they aren't bound by our everyday constraints. The string is truly one dimensional, and by existing in the time plus space dimensions of its background, it sweeps out a two dimensional surface, its "world sheet". But you have to know that modern string physics has things called branes which are multi-dimensional, and in some theories they are what constitute our spacetime. It almost seems with superstring theory that they add dimensions like epicicles were added when the first few ideas of our galaxy were being drawn up. The extra dimensions come straight out of the quantization of the strings. You can only do an anomaly free quantization in certain dimensions: 26 for bosonic strings, 10 for superstrings, and 11 for M-theory. Well just a question[?] Welcome to MKaku forum and Physics Forum. I hope we can help you with your lecture here.