I had heard about strange particles, that is hadron–well, we didn't know at that time that they were hadrons–particles found in cosmic radiation, initially in cosmic radiation, which were apparently copiously produced–not perhaps as copiously as the pion, but still they were quite copiously produced–but decayed rather slowly. I first heard about them when Leprince-Ringuet came to MIT when I was a graduate student and he spoke about his work.  Then we heard about Rochester and Butler in England. And then all of that work was pursued at Caltech by Carl Anderson and his team. They were called hooks and forks, from the forms of the tracks in a bubble chamber, or later on in a cloud chamber–I mean, sorry, in a cloud chamber or later on in a bubble chamber. And Carl had a… a sign on his blackboard that read: 'What have you done about hooks and forks today?' And in the laboratory that he and Leighton and others used on top of White Mountain–almost as high as Mount Whitney and on the other side of the… of the valley. In that laboratory they found I think the second through the thirteenth lambda particle, or something like that. And they found psi particles–what I later called psi particles and so on and so forth. But anyway, I had heard about these strange particles and I was of course interested like all other theorists in knowing what they were.