what is this thing on the egg?

Oh contrare. The ovaduct is a single uro-genital opening. In fact - the tummy and reproductive tract do join - and fecal matter can become enclosed in shell. At least, that is what I learned in school in the 60s.
 
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Hey guys... you don't have to crack 'em to check if they're good: Put the egg into a pan of cold water; the fresher the egg, the sooner it will fall to the bottom; if rotten, it will swim at the top.
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