shape index

I have decided to do an experiment. After reading this paper on Shape Index of eggs and how that can essentially predict the sex of a chick before hatch. I decided why not? I am going to hatch, why not just see if there is any truth to it. It's kind of fun, regardless of outcome! Makes for a...

I am wondering if anyone out there has ever tried waiting longer than 36 hours to set shipped eggs? My question is really, if the aircells are unstable will time alone fix this(just sitting fat end up), or does the start of development of a embryo actually need to happen to have it stabilize? I...