Skipping a stone across water requires skill and patience and, of course, a great stone. Personal preference may send you to a flat, light one, which seems to skip easier. But scientists have found that is not the only way to get impressive leaps. A recent University of Bristol study researched how shape and mass affect the way objects interact with water. And it found that a heavier rock with a good curve — imagine the shape of a mango but smaller —  can get an impressive bounce. David Hu, a professor with the School of Biological Sciences and the George W. Woodruff School of Mechanical Engineering, and an adjunct professor in the School of Physics, did not take part in the study but comments on how surprised he was that the Bristol scientists studied curved objects.