I avoided commenting on this topic because I wanted to see how it progressed. I am happy to see it seems to be still on the rails.
I also want to compliment Shakey 7 for explaining some of the definitions to his son. MY comment to that is there is a nice term for those subject specific uses of words, "term of art."
That said I will link a thread from elsewhere on SCF
https://goscf.com/t/84171&whichpage=1 which discusses a fly speck in detail. It also describes a fly speck which has great value as an identification and dating tool. The thread also discusses helpful fly specker resources.
Edit to add a missed ed.