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Reply	Anonymous says: It#39;s to allow the ink to flow. Without it, using teh ink would slowly create a partial vacuum in the casing which would eventually stop the ink flowing. (Perhaps!)try blocking the hole amp; seeing if teh pen eventually stops working!  (no votes) Tags: domestic science, human body.
	posted on 2008-12-23 15:46:00 | Report abuse

Reply	Mikhail_G says: It looks like two eggs were developed from the begining. The first one was growing faster then the second one. Finally, unfortunately, the first egg died, but kept as a shelter the second one. Very rare, but could happen.Mikhail Gaichenkov, Moscow  (no votes) Tags: domestic science, human body.
	posted on 2008-12-31 11:32:00 | Report abuse

Reply	Anonymous says: There was a documentary on the Discovery Health channel which showed a fetus in situ fetus. This is a fetus that has fully developed inside of another fetus. I would think that this double egg is the same kind of thing.  (no votes) Tags: domestic science, human body.
	posted on 2009-01-03 00:32:00 | Report abuse

Reply	Anonymous says: It is very easy. The egg unfertilized is the equivalent of a period. One dis-attached from the wall of the uterus early and for some odd reason wasn't expelled, allowing another to form around it. Due to chickens being bred to lay an egg everyday the chicken wouldn't have to retain the egg very long before another one started forming around it.  (no votes) Tags: domestic science, human body.
	posted on 2009-01-15 23:02:00 | Report abuse

Reply	Anonymous says: how eggsiting! the mystery has been cracked :)  (no votes) Tags: domestic science, human body.
	posted on 2009-01-16 14:02:00 | Report abuse

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