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Know It All: Wednesday's top stories from NBC News

Marchers hold signs during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington.
Marchers hold signs during the 50th anniversary of the 1963 March on Washington for Jobs and Freedom at the Lincoln Memorial in Washington.Kevin Lamarque / Reuters

Some of the top stories that NBC News is following this Wednesday:

They heard the dream: Memories from six at the March on Washington

It was 50 years ago today that 200,000 people swarmed the National Mall for the March on Washington and heard perhaps the greatest speech in American history — Martin Luther King Jr.’s “I Have a Dream.” NBC News asked six African-Americans who were there to share their memories. Read them here.

#DreamDay: Americans share their visions

“I have a dream that … ” NBC News is asking Americans to finish that sentence as they pause to reflect on the 50th anniversary of the March on Washington. Sir Richard Branson, Bill Gates, the Dalai Lama and Martin Luther King III are among those who have sent their answers. Read them, and send us yours, here.

Al Qaeda-linked group vows revenge in Syria as apparent strike nears

A terror group linked to al Qaeda is promising a “volcano of revenge” against Syria as the United States prepares for a military strike that could begin as early as Thursday. Four Navy destroyers are ready to attack, and world leaders are calling each other to talk about plans. Read the latest on the crisis here.

A Syrian hospital struggles to identify the littlest victims

As the world prepares for military action, a hospital in Syria is still struggling to identify the youngest of the dead a week after what appears to be the worst chemical weapons attack in a generation. One of them is a month-old girl marked down as simply Unknown No. 14. Read more from inside the hospital here.

Still-growing California wildfire sends smoke into Nevada

It is one of the largest wildfires in California history — almost 200,000 acres and sending smoke 100 miles away to Nevada. Dozens of homes and other buildings have been destroyed. Firefighters have gained ground, but the blaze is expanding. Read more about the battle here.

Home prices up sharply: Is it time to sell?

As the economy slowly heals, home prices are up 19 percent in Atlanta, 20 percent in Los Angeles and almost 25 percent in San Francisco. It’s been a while since the question even seemed possible, but is it a seller’s market again for houses? Get analysis from “Nightly News” here.

Teen in veteran’s beating says it was a crack deal

One of the teenagers charged with beating an 88-year-old World War II veteran to death says he was buying crack cocaine from the old man when the transaction turned violent. The veteran’s daughter-in-law says it’s “a bunch of crock.” Read what the police say about it here.

Upstart teen says she’s ‘trying to make American tennis become what it used to be’

The talk of the U.S. Open is a 17-year-old with a squeaky voice and white-rimmed glasses named Victoria Duval. She knocked off one of the tournament’s past champions Tuesday night in three sets, then took two huge leaps in celebration at Armstrong Stadium. Read how she did it from NBC Sports here.

Ben Affleck as Batman: One fan’s idea of what it might look like 

Ben Affleck’s much talked-about turn as Batman doesn’t hit theaters until 2015, but there’s already a trailer. It was put together by a fan on YouTube using clips from other Affleck movies, and it’s quickly gaining popularity. Will it win over the crowd who doesn’t buy Affleck for the role? Read more from TODAY here.