Considering the obvious limits of the human senses that have been enhanced by relative recent strides in technology and science, we must consider our species is in its infancy and deduce that there should be 'more' than our present concept of three dimensions. . .the alternative is the arrogant conclusion that present human perception (limited) and science (growing rapidly but nowhere near finished) have 'answered' the issues of 'only three' dimensions which doesn't make much sense. We're glorified primates who haven't mastered the take-out burger- I'm sure we haven't settled the issue of the number of dimensions yet.