I eat a lot of boiled eggs. Their easy to make and easy to grab as you head out the door. But I hate trying to peel and old egg. I saw this today and thought I would share. The original post can be found here.
If the egg sinks to the bottom of the water or only one end of it rises up slightly, you can eat it without worries. If it rises to the top of the water, you should throw it out at once, because it is unfit for consumption. The reason is, the eggshell is a porous material, which lets out moisture and lets in air. As the contents of the egg become dryer and denser, more and more air gets inside, making the egg becoming lighter over time.
“Eggs in a Straw Nest” image courtesy of satit_srihin at freedigitalphontos.net
Jaques Kitchen 
Reblogged this on Jaques Kitchen and commented:
In this post I mentioned that I eat a lot of boiled eggs. i also said that I hate trying to peel and “old” egg. Interestingly I may have had this all wrong. This post seems to imply the problem is actually the result of using eggs that are too fresh. http://www.edinformatics.com/math_science/science_of_cooking/boiled_eggs.htm
What do you think?
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Ohh that picture will be helpful! Thank you! I love making hard boiled eggs in the pressure cooker – it’s quick and the resulting eggs are super easy to peel. According to Alton Brown, the ideal egg age is ~10 days old: http://altonbrown.com/pressure-cooker-eggs-recipe/
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Good to know. We looove Alton Brown.
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