War between the sexes begins before twins' birth

The battle of the sexes may begin in the womb, researchers from Tel Aviv University believe. And it may have troubling consequences — a male twin can compromise the health of his twin sister before she is born.

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<p><a href="http://www.physorg.com/news126800469.html">War between the sexes begins before twins' birth</a></p> <p>The battle of the sexes may begin in the womb, researchers from Tel Aviv University believe. And it may have troubling consequences — a male twin can compromise the health of his twin sister before she is born.</p>