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KNOW IT ALL: Wednesday's Top 7 Stories at NBC News

From the sentencing of ex-Nazi guard Oskar Groening to the video showing 'El Chapo's escape, see the stories we're following today.
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Good morning. Here are some of the stories we're following today:

1. ‘Accountant of Auschwitz’ Sentenced to 4 Years in Jail

Oskar Groening, the 94-year-old former Nazi guard, was convicted Wednesday on 300,000 counts of accessory to murder and sentenced to four years in jail by a German court. Groening — who entered the courtroom with the help of a walker — sat quietly during the reading of the verdict and did not make any comments as he left. It was not immediately clear how he will serve his time. Read more in NEWS.

2. Video Shows Audacious ‘El Chapo’ Escape

Mexican authorities released video Tuesday of drug kingpin Joaquin "El Chapo" Guzman in his cell the night of his brazen escape from a supermax prison through a mile-long tunnel — including the moment he apparently vanished. The videos show not only Guzman's cell but also the entrance into the tunnel through which he escaped Saturday night. Read more in NEWS.

3. NASA Probe Phones Home After Pluto Flyby

Signals from a spacecraft 3 billion miles away swept over Earth on Tuesday, confirming that NASA's New Horizons probe survived its history-making Pluto flyby. The radio signals were received by a Deep Space Network antenna in Spain four and a half hours after they were sent out from the spacecraft at the speed of light — and a full 13 hours after the probe made its close pass. Read more in SCIENCE.

4. Arab World Worries Nuclear Pact Will Boost Tehran

The nuclear deal with Iran was met with a profound wariness in the Arab world, where concerns are widespread that the easing of its international isolation could tip the already bloody contest for power in the region toward Shiite-led Tehran. Arab countries have deep fears of Iran gaining a nuclear weapon, and some have been skeptical that a deal could prevent that from happening. Read more in NEWS.

5. Wreckage Found in Plane Crash With Teen Survivor

Search teams said late Tuesday they had found wreckage after a teenage girl survived a plane crash and walked for more than a day through the wilderness in Washington state. Autumn Veatch, 16, and her step-grandparents were flying from Montana when she said their small aircraft crashed into densely forested hills while navigating in thick fog on Saturday. Read more in NEWS.

6. Trump Campaign Tweets Image Featuring Nazi Uniforms

Republican presidential candidate Donald Trump's campaign on Tuesday inadvertently tweeted a promotional photo featuring what appeared to be Nazi German soldiers superimposed on the U.S. flag alongside the real estate magnate's face. The gaffe, which Trump's campaign blamed on an intern, come after he provoked controversy with comments about Mexican rapists immigrating to the United States. Read more in POLITICS.

7. Young Renters Being Left Behind in Wealth-Building

Americans in their 20s and 30s share something troubling in common: They're renters, weighed down by high student loans and low credit scores, squeezed by rising rents and required down payments, with homeownership a distant goal. And economists worry that these millennials are missing out on a crucial opportunity to build wealth. Read more in BUSINESS.

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