Fluctuations, fluctuatingly and then some

Frank Wilczek writes, in his essay “What is the Electron“, of how people have figured out how to make better and better (and better) measurements pertaining to that teeny tiny particle:

“Theoretical calculations have  become intricate, now including fluctuations in  fluctuations in fluctuations.”

A version of that essay is part of Nature magazine’s celebration of the 100th anniversary of Neils Bohr’s idea that the atom is a quantum beastie.