"TheAlligator" > wrote in message
...
> Siobhan Perricone > wrote:
>>You don't need a fancy system for keeping track of dates here. You fill a
>>deep bowl with cold water and gently place an egg on the bottom of the
>>bowl (don't drop it in, actually place it on the bottom of the bowl) if
>>the
>>egg floats to the top don't use it. If it turns up on end but touches the
>>bottom you can still use it. I usually don't use them if no part of the
>>shell touches the bottom of the bowl.
>>
> Any idea of the mechanism involved? As in - why DOES this work.

The older it gets, the egg insides shrink, and there is more air inside the
shell, hence the floating. I'm sure someone can provide a more technical
answer, but that is the general idea.

nancy