halfwit
I like turtles.
As usual, you are right on the whole. The series actually only converges at infinity ... the 4 half-lives is just an arbitrary cutoff where some 90+% is reached.
Yup. I want to say that it comes out to 96%, but it's been awhile since I plugged it all in. That's why I just prefer to use the algebraic method as it doesn't give information that's only really significant to pure mathematics. (A0 = A1e^-k(t). )
You're a smart cookie Mprtz!