You looking for the embryo, that spec of white near the yoke? I didn't quite get what you meant by "puff". It could just be they are using older hens longer. I was reading an article the other day that if you notice a difference in the shell structure cracking more easily and into smaller pieces when being cracked, it's because older hens produce thinner shells. Usually they retire out hens after three to four years to maintain a stronger shell structure, but with the flu killing off so many hens, they've been keeping older hens producing to keep up with demand. I am beginning to wonder how much the bird flu really contributes to the shortage of eggs here, and why it seems to get worse during winter months. Since 2020, when the Trump trade agreements were signed right before he left office, increased exports of eggs has gone through the roof into the millions. At five bucks or more a carton, they shouldn't be exporting eggs out of the country. Eggs help support the human immune system, chickens actually have a better immune system than humans, they provide humans with that extra link they have in their immune chain. I'd have to look it up again in my Egg Conspiracy theory ops I did on it to recall the name exactly, but the reality is, if they could keep consumers from eating eggs during cold and flu season, they aren't getting that extra bump of protection from eating eggs.