Ah, good old Barry Setterfield.
Barry Setterfield’s c-decay was the first indication to me that all was not well in the land of YEC-dom. I had been an all-guns-blazing YEC for less than three months when I was introduced to it, and even as a first year A level physics student it looked waaaaaaaaay off base. Historical measurements of the speed of light, made with primitive equipment and techniques that were simply not up to the job of tightening down the error bars enough to make a reasonable case, an equation for the decay curve that seemed to be pulled out of thin air, and then there was this cut-off date in the late 50s/early 60s which coincided suspiciously closely with the invention of the laser, and with it the necessary precision to blow the gaff on the whole thing – what was that all about??? It breaks every rule on how to measure things that you can think of, and then some. I ditched YEC in favour of OEC a couple of months later on discovering 2 Peter 3:8.
What amazes me is that some of the more lucid and scientifically literate YECs that I know on Facebook actually think he’s onto something. The mind boggles.