In the decades since, nuclear transmutations have been performed, in particle accelerators, all over the periodic table, observing in detail the properties of various isotopes. These have confirmed E=mc<sup>2</sup> with great precision. Perhaps the most precise test, by Rainville ''et. al.''<ref name="rainville">http://www.nature.com/nature/journal/v438/n7071/full/4381096a.html Nature 438, 1096-1097 (22 December 2005)] doi:10.1038/4381096a; Published online 21 December 2005</ref>, confirmed the equation to an accuracy of a few parts per million. | In the decades since, nuclear transmutations have been performed, in particle accelerators, all over the periodic table, observing in detail the properties of various isotopes. These have confirmed E=mc<sup>2</sup> with great precision. Perhaps the most precise test, by Rainville ''et. al.''<ref name="rainville">http://www.nature.com/nature/journal/v438/n7071/full/4381096a.html Nature 438, 1096-1097 (22 December 2005)] doi:10.1038/4381096a; Published online 21 December 2005</ref>, confirmed the equation to an accuracy of a few parts per million. |