Lessons from brain science — and history's peacemakers — for resolving conflicts

Shirley Chisholm, the first Black woman elected to U.S. Congress was running for president in 1972 when she had a remarkable interaction with the pro-segregation George Wallace, then governor of Alabama. Her efforts to build bridges with him ultimately changed his point of view. She's pictured here giving a speech at Laney Community College during her presidential campaign. (Howard Erker/Oakland Tribune-MediaNews Group via Getty Images)

Deeply entrenched conflicts are dividing the world – and many people's social circles.

The violence in Israel and Gaza is triggering often overheated discussions among friends, family and strangers. This comes on top of other, increasingly sharp, rifts in the U.S., including fights over gun control, policing, abortion and other social and political issues.