bove the superconductor as shown below: 2P_GrealesiSleryEverTold_AC.indd 194 12/16016 3:06 PIA EFTA00286116 Living inside a Superconductor 195 Pnotopapn biPm This is possible for a reason discovered in an experiment in 1933 by Walther Meissner and colleagues, explained by theorists Fritz and Heinz