Black holes are among the oddest objects believed to populate the universe. Long sought, they have recently been "found" lurking in the centers of galaxies, tipping the scales at a million to a billion times the mass of the sun. Now, just to stir things up, enticing hints have come to the fore that tiny black holes may exist, and if so, they may hold the key to testing whether the universe has more to offer than the three familiar spatial dimensions of length, width, and height. Find out more in this article from NOVA Online.