What if the visible universe was just a membrane embedded in a another universe, one that had an extra dimension? There would be thousands of tiny black holes, left over from the Big Bang, floating around in our solar system alone. It’s way beyond my education in science, but this ‘braneworld theory’, a counter to general relativity, is a serious idea being kicked around – serious enough that the Gamma-ray Large Space Telescope being launched next year will be used to look for evidence in support of it.