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The Chicago-based Bulletin of the Atomic Scientists announced Thursday that the clock will now be set at 100 seconds to midnight. (Lexey Swall Photography / Bulletin of the Atomic Scientists)

The world is closer to global catastrophe today than at any point since World War II, according to a group of international nuclear and climate scientists.  

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Rescue workers carry the body of a victim of a Ukrainian plane crash in Shahedshahr, southwest of the capital Tehran, Iran, Wednesday, Jan. 8, 2020. (AP Photo / Ebrahim Noroozi)

It’s the latest in a string of tragic news involving Chicago-based Boeing: A 737 jet crashed Wednesday, killing all 176 people on board. We discuss that incident and what the future holds for Boeing with Tracy Rucinski, U.S. aviation correspondent for Reuters.

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The closing bell of the New York Stock Exchange on Thursday, Jan. 9, 2020. (WTTW News via CNN)

The U.S. stock market closed at record highs Thursday, indicating investor confidence as relations between the U.S. and Iran appear to cool down. Ed Stuart and Michael Miller share their thoughts on current economic conditions.

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Speaker of the House Nancy Pelosi, D-Calif., meets with reporters following escalation of tensions this week between the U.S. and Iran, Thursday, Jan. 9, 2020, on Capitol Hill in Washington. (AP Photo / J. Scott Applewhite)

Reigniting a debate over who has the power to declare war, the Democratic-controlled House on Thursday approved a resolution asserting that President Donald Trump must seek approval from Congress before engaging in further military action against Iran.

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President Donald Trump addresses the nation Wednesday, Jan. 8, 2020 from the White House on the ballistic missile strike that Iran launched against Iraqi air bases housing U.S. troops, as Vice President Mike Pence, Secretary of State Mike Pompeo and military leaders look on. (AP Photo / Alex Brandon)

The U.S. and Iran stepped back from the brink of possible war on Wednesday as President Donald Trump signaled he would not retaliate militarily for Iran’s missile strikes on Iraqi bases housing U.S. troops. 

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Iranian lawmakers chant slogans as some of them hold posters of Gen. Qassem Soleimani, who was killed in Iraq in a U.S. drone attack, in an open session of parliament, in Tehran, Iran, Tuesday, Jan. 7, 2020. (AP Photo / Vahid Salemi)

Iran struck back at the United States early on Wednesday for killing its most powerful military commander, firing a barrage of ballistic missiles at two Iraqi military bases that house American troops.

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President Donald Trump speaks during a meeting with Greek Prime Minister Kyriakos Mitsotakis in the Oval Office of the White House, Tuesday, Jan. 7, 2020, in Washington. (AP Photo / Alex Brandon)

President Donald Trump and his top advisers are under pressure to disclose more details about the intelligence that led to an American airstrike that killed top Iranian Gen. Qassem Soleimani.

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Mourners holding posters of Iranian Gen. Qassem Soleimani attend a funeral ceremony for him and his comrades, who were killed in Iraq in a U.S. drone strike on Friday, at the Enqelab-e-Eslami (Islamic Revolution) Square in Tehran, Iran, Monday, Jan. 6, 2020. (AP Photo / Ebrahim Noroozi)

President Donald Trump’s decision to assassinate Iran’s top military leader because of an alleged “imminent threat” to U.S. interests is already having major repercussions across the region. What’s next in the U.S.-Iran showdown?

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President Donald Trump speaks during an “Evangelicals for Trump Coalition Launch” at King Jesus International Ministry, Friday, Jan. 3, 2020, in Miami. (AP Photo / Evan Vucci)

An expert on Iranian culture says he was “appalled” by President Donald Trump’s threat to attack dozens of Iranian sites. We speak with Matthew Stolper of the University of Chicago’s Oriental Institute.

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President Donald Trump delivers remarks on Iran, at his Mar-a-Lago property, Friday, Jan. 3, 2020, in Palm Beach, Fla. (AP Photo / Evan Vucci)

President Donald Trump declared Friday that a “reign of terror is over” as he marked the death of an Iranian general killed in a U.S. strike and as the Pentagon scrambled to reinforce the American military presence in the Middle East in preparation for reprisals.

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President Donald Trump pauses while speaking during a bilateral meeting with Egyptian President Abdel Fattah al-Sissi at the G-7 summit in Biarritz, France, Monday, Aug. 26, 2019. (AP Photo / Andrew Harnik)

President Donald Trump said his trade negotiators had received two “very good calls” from China on Sunday. But a spokesman for China’s foreign ministry said that he didn’t know what calls Trump was talking about.

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In this May 28, 2019 photo, Iran’s Foreign Ministry spokesman Abbas Mousavi speaks at a press conference in Tehran, Iran. (AP Photo / Vahid Salemi)

The decision to ramp up uranium enrichment came less than a week after Iran acknowledged breaking the 661-pound limit on its low-enriched uranium stockpile.

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This Jan. 15, 2011 file photo, shows a part of Arak heavy water nuclear facilities, near the central city of Arak, 150 miles southwest of the capital Tehran, Iran. (Mehdi Marizad / Fars News Agency via AP, File)

Iran acknowledged Monday it had broken the limit set on its stockpile of low-enriched uranium by the 2015 nuclear deal, marking its first major departure from the unraveling agreement a year after the U.S. unilaterally withdrew from the accord.

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“I think a lot of restraint has been shown by us. A lot of restraint. That doesn’t mean we’re going to show it in the future,” President Donald Trump said Monday, June 24, 2019 in announcing new economic sanctions against Iran.

New economic sanctions on Iran: will they prevent a military showdown? Robert Pape, director of the University of Chicago Project on Security and Threats, offers his insight.

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In this photo released by the official website of the office of the Iranian Presidency, President Hassan Rouhani speaks in a cabinet meeting in Tehran, Iran, Wednesday, May 8, 2019. (Iranian Presidency Office via AP)

Iran threatened Wednesday to resume higher enrichment of uranium in 60 days if world powers fail to negotiate new terms for its 2015 nuclear deal a year after President Donald Trump withdrew from the accord.

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After more than 20 months of negotiations, a landmark deal was reached Tuesday between world powers and Iran that curbs Iran’s nuclear program in exchange for the easing of economic sanctions. The deal reduces Iran’s stockpiles of enriched uranium and the number of its centrifuges by two-thirds. It also prevents Iran from producing weapons-grade plutonium. 

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