(Our happy hour fact to amaze your drinking buddies with.)

A Finnish scientist believes belly button shape may be an indicator of a woman's ability to have healthy children.

Writing in the journal for the Federation of American Societies for Experimental Biology, Aki Sinkkonen suggests that the umbilicus (belly button) is essentially a fossil left from one's own time in the womb. Therefore, the umbilicus' "symmetry, shape, and position can be used to estimate the reproductive potential of fertile females, including risks of certain genetically and maternally inherited fetal anomalies."

Previous studies have found that people prefer belly buttons that are T-shaped, relatively flat and don't protrude (no outies.) This led Sinkkonen to speculate that this type of desirable belly button could be a fertility tip-off.

So ladies, flaunt those navels -- it's nothing short of your evolutionary duty.

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