By Issam AHMED Watching someone cry often evokes an emotional response — but according to a new study published Thursday, human tears themselves contain a chemical signal that reduces brain activity linked to aggression. The research was carried out by the Weizmann Institute of Science, Israel, and appeared in PLOS Biology, a US science journal. Though it involved female tears, because women made themselves available as donors, it probably isn’t a sex-dependent effect, the authors […]