Do show the data from a million years ago showing the decay rate, complete with atmospheric and other conditions, then show the records on anything from a comet, to whatever that may or may not have affected the radiation levels from day one to the present.
"Why would we need to know the 'starting amount of radioactivity'? What does that even mean? Do you think radioactivity comes in liters?" *SIGH* The radiation levels of the rock at it's creation, you know what it started with to determine how much has actually decayed.
"And then the oldy but still-not-deceased strawman of 'evolution happening by accident and random chance'. Come on Oboehner, you can do better than that. Why not use the second law of thermodynamics? Or why are there still monkeys?" Instead of this useless psychobabble, why not fill me in on what really happened from the beginning, show pictures of the observable, testable repeatable "science" at the beginning. Was there an exploding dot like it says in high school textbooks or what?