This week, we’re joined by comedian Nate Bargatze who discusses his faith, what it’s like to perform on "The Tonight Show," his worst gig ever and more. Also, the gang talks about what your Instagram feed says about your mental health, why Jim Gaffigan is ending his show, pizza delivery drones and a lot more! Read More

Previously unknown information is being uncovered about Kayla Mueller's 18 months in captivity on 20/20 "The Girl Left Behind."

Mueller, a 25-year-old humanitarian and activist from Arizona, was kidnapped by ISIS in August 2013 in Syria.

Information about Mueller's time is being pieced together more than a year after her death through interviews with others who were held as hostages alongside her throughout her lengthy time in captivity.

Mueller is said to have been tortured, abused, forced into slave labor and raped, but she continued to be hopeful and stood up for her Christian faith.

The special also includes a proof of life video that was made in 2013, shortly after Mueller had been taken hostage.

The video was only 10 seconds long and featured Mueller in a black headscarf begging for help.

"I need your help. I've been here too long and I've been very sick and it's very terrifying here."

One of her fellow hostages, Daniel Rye Ottosen, a Danish photograph, recounts the story of how Mueller remained a firm Christian.

He told ABC News:

One of the Beatles (a name the hostages gave their guards) started to say, 'Oh, this is Kayla, and she has been held all by herself. And she is much stronger than you guys. And she's much smarter. She converted to Islam.' And then she was like, 'No, I didn't.'

The special also interviews a young Yazidi girl who shares the story of how Mueller gave up a chance to escape with other young hostages who were held as sex slaves so they would have an easier time getting away.

I told Kayla, 'We want to escape,' and I asked her to come with us. She told me, 'No, because I am American. If I escape with you, they will do everything to find us again.' It is better for you to escape alone. I will stay here.

The special will air tonight. Discuss

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The White House announced today that 28 companies in the private sector have pledged their commitment to closing the gender pay gap for their employees—fitting for Women's Equality Day.

The companies range across multiple industries including Apple, Delta Air Lines, Hilton, Ikea and more.

In the United States, women working full time earn an average of 79 cents for every dollar men make, according to Census data. Black women are paid 63 cents and Latina women 56 cents compared to every dollar paid to white men.

Several recent studies have confirmed the existence of the wage gap across industries and employment levels.

More than 50 companies have signed the White House Equal Pay Pledge, which has been in the works for some time now. In January, President Obama signed an executive order requiring businesses with more than 100 employees to report their wage data broken down by race and sex to the U.S. Equal Employment Opportunity Commission.

Each company that signed today included a personal pledge. Some excerpts are below:

Apple:

Equal work deserves equal pay. This past year, Apple looked at the total compensation for U.S. employees and closed the gaps we found. We’ve achieved pay equity in the United States for similar roles and performance. Women employees at Apple earn one dollar for every dollar male employees earn.

Facebook:

Facebook is a longtime supporter of equal pay. We regularly review our compensation practices to ensure pay equity, and have done so for many years. We complete thorough statistical analyses to compare the compensation of men and women performing similar work. As such, we are proud to share that at Facebook, men and women earn the same. We encourage efforts to establish methods to close the wage gaps around the world.

Ikea:

We know that each individual adds value to the team, and we are committed to creating an inclusive work environment that encourages our diverse and competent co-workers to be themselves, to apply their unique perspectives at work, and to assume responsibility for our growth. In addition to being the right thing to do, creating this environment also improves our business results and strengthens our competitiveness.