This is a good point. Strands and strings are very small in certain directions and very long in others. Can they be observed? Schiller males the point that the whole universe is made of one single strand that criss-crosses space in all directions. Is that a serious model? I do not know. But with the large dimensions one can ensure that the strands can be observed. On the other hand, the short dimension cannot be detected. Observations would just allow to say that something is there, and it is smaller than can be measured. Is that permissible in a TOE? I am not sure.


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