Rhythmic

An enormous tornado with a debris cloud two miles wide tore through the metropolitan area just south of Oklahoma City on Monday afternoon.

UPDATE 9:28 p.m. EST: At least 51 people were killed in the storm, including seven children from Plaza Towers Elementary School in Moore, according to KFOR in Oklahoma City. The news station reported that 75 student and staff were inside the school when the storm struck. Officials said Monday night that the search of the rubble remaining of the school had turned to a recovery mission.

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On Sunday, at least 25 tornadoes pummeled states across the Midwest and Great Plains. At least two people died in the storms. Even more harsh weather, and not just tornadoes, is set to hit much of the rest of the country on Monday.

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The second leg of horse racing's Triple Crown and NASCAR's All-Star event highlight the upcoming sports calendar. Here's what to watch this weekend:

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If you have good neighbors, consider yourself lucky.

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With the explosion of smartphones and tablets, it should come as no surprise to find out that we spend a lot of time checking our work email when we’re not even in the office.

But just how much do we do it?

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Special Agent Rick DesLauriers of the FBI, who is leading the investigation of the Boston Marathon bombings, just held a press conference in which he revealed that there are two suspects. The FBI released photographs and video of two men believed to be responsible for the attacks.

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A heart-wrenching photo of 8-year-old Martin Richard, who was killed in the Boston Marathon bombing on Monday, shows the boy holding a hand-drawn sign that says, "No more hurting people. Peace."

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Ever wonder why some years Easter is in early April, sometimes late April, and sometimes—like this year—it's in March? Why isn't it a fixed date, like most other holidays? Well, it's a bit complicated.

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A 16-year-old boy in Florida who stopped a classmate with a gun is not being hailed as a hero.

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UPDATE 4:07 p.m. EST: Authorities have identified the gunman as William Spengler, an ex-convict who spent 17 years in prison for murdering his 92-year-old grandmother in 1980.

Spengler was paroled for the crime in 1998.

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During a Sunday news conference, police said the gunman in Friday's school shooting at the Sandy Hook Elementary School in Newtown, Conn. possessed much more ammunition in addition to the rounds he used to kill 20 children, seven adults and himself. Authorities also responded to a phoned-in threat at a church near the scene of the tragedy which has left the small New England town shaken and in a state of solemn mourning.

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NOTE: This post will be continually updated as new information comes in. Video and photos are below. All times Eastern.

UPDATE 6:30 p.m.: Originally it was thought that Adam Lanza, the gunman, shot his mother at the Sandy Hook Elementary school, where she was a teacher's aide. ABC has learned that, in fact, Nancy Lanza was killed at her home (by her son) prior to the massacre. He then drove to the school, where he killed 20 children and six adults, before killing himself.

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