The fourth war between Israel and Hamas since the latter took power in Gaza 14 years ago killed hundreds of people, mostly Palestinians, and left unresolved the historical grievances between two peoples whose national aspirations compete for the same piece of earth. What will it take to end this conflict? Two people who work for the cause of peace, Lucy Kurtzer-Ellenbogen and former Ambassador Hesham Youssef, explain why the Israeli-Palestinian conflict seems so intractable.