OK, if you've read this in Physics Today or some other publications, you should disqualify yourself. This is one of the most famous picture of Enrico Fermi. Yet, this picture has been a constant 'debate' among many physicists and science historians. Can you spot what is the issue with this picture? http://www.phy.mtu.edu/images/area/EnricoFermi.jpg [Broken] Zz.