Kotlikoff told CBS MoneyWatch.

as a test case for future releases.One constant has been the prioritization of civilians about 50 of them in particular over the Israeli military service members who are also being held hostage.

including an American mother and daughter.I cannot look you in the eye and tell you that they are still alive.Israeli officials have indicated to the U.

He said he was doing everything he could to ensure their safe return.National Security Adviser Jake Sullivan said of the American hostages earlier this week.

there has been a focus on roughly 50 civilians.

One complication in these final stages of the talks has been Hamas inability to account for each of the hostages it is either believed to be holding or able to find.A 2011 studyconcludedthat there is an 80% probability the heat wave would not have occurred without global warming.

or illegally opening fire hydrants.Berardelli said extreme heat causes more deaths per year in United States than any other weather hazard.

Firefighters control a burned area near Flix on June 28.Getty Four people have drowned so far in France this week.