This is looking into the eye of the fire, the popcorn fire. This was intentionally done...I really am a wonderful cook, even if it is just popcorn, see...
Here's what we did (I'll share this easy, yet impressive project)...We bought four different brands of popcorn and popped one bag of each at the minimum recommended time, one bag each until it slowed to two seconds between pops (and documented what that time was), and one bag each at the maximum recommended time. We then recorded how full each bag was, the appearance of the popcorn (if any burned), and counted how many kernels were left.
Something I learned about with this little project is - to never trust the time on the box! Two of them burned at the minimum time recommended. One only popped about ten kernels and we had 512 left unpopped and another was almost perfect.
I won't bore you with all of the gorey details but I will say this...Of the brands Pop Secret, Act II, Orville Redenbacher and a generic, always buy Pop Secret. I now know it cooks up fluffier, tastes better and has the least amount of leftover kernels.