Chris Chaberski

Here’s a look at some interesting events that took place on this day in history:

1803: The Louisiana Purchase is completed at a ceremony in New Orleans (more info)

1860: South Carolina becomes the first state to secede from the United States (more info)

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Here's a look at some notable birthdays being celebrated today:

Jonah Hill
Age: 29
Occupation: Actor, Screenwriter and Comedian
Known For: Roles in films like 'Superbad,' 'Knocked Up,' 'Funny People,' 'Get Him to the Greek' and 'Moneyball', and creating the short-lived cartoon 'Allen Gregory'

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Here’s a look at some interesting events that took place on this day in history:

1776: Thomas Paine publishes one of a series of pamphlets in the Pennsylvania Journal titled 'The American Crisis' (more info)

1777: George Washington's Continental Army goes into winter quarters at Valley Forge, Pennsylvania (more info)

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Here's a look at some notable birthdays being celebrated today:

Jake Gyllenhaal
Age: 32
Occupation: Actor
Known For: Roles in films like 'Donnie Darko,' 'The Day After Tomorrow' and 'Jarhead,' earning an Academy Award nomination for Best Supporting Actor as Jack Twist in the film 'Brokeback Mountain,' being the little brother of actress Maggie Gyllenhaal, and previous relationships with Kirsten Dunst and Reese Witherspoon

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Here’s a look at some interesting events that took place on this day in history:

1903: Near Kitty Hawk, North Carolina, Orville and Wilbur Wright make history's first successful flight in a self-propelled, heavier-than-air aircraft (more info)

1944: The U.S. Army announces the end of its policy of holding Japanese-Americans in internment camps, allowing "evacuees" to return home (more info)

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Here's a look at some notable birthdays being celebrated today:

Milla Jovovich
Age: 37
Occupation: Actress and Model
Known For: Appearing in 'Dazed and Confused,' 'The Fifth Element,' and 'The Messenger: The Story of Joan of Arc,' starring in the film adaptation of the video game 'Resident Evil,' and founding the production company Creature Entertainment

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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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Here’s a look at some interesting events that took place on this day in history:

1799: President George Washington dies at the age of 67 (more info)

1903: The Wright brothers make their first attempt to fly with the Wright Flyer in Kitty Hawk, North Carolina (more info)

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Here's a look at some notable birthdays being celebrated today:

Vanessa Hudgens
Age: 24
Occupation: Actress and Singer
Known For: Her portrayal of Gabriella Montez in the 'High School Musical' franchise, roles in other films like 'Thirteen' and 'Bandslam,' a previous relationship with her 'HSM' co-star Zac Efron, and a scandal caused by self-taken nudie shots being leaked on the Internet without her knowledge

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Here's a look at some notable birthdays being celebrated today:

Taylor Swift
Age: 23
Occupation: Singer, Songwriter and Musician
Known For: Selling eleventymillion albums and singles, winning a boatload of Grammys and CMA awards, being all-around cultural phenomenon, and her endless string of celebrity boyfriends

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Here’s a look at some interesting events that took place on this day in history:

1577: Sir Francis Drake sets out from Plymouth, England, on his round-the-world voyage (more info)

1862: At the Battle of Fredericksburg, Confederate General Robert E. Lee defeats the Union Major General Ambrose E. Burnside in a decisive loss for the Union army (more info)

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Here’s a look at some interesting events that took place on this day in history:

1901: Italian physicist and radio pioneer Guglielmo Marconi succeeds in sending the first radio transmission across the Atlantic Ocean (more info)

1913: Two years after it was stolen from the Louvre museum in Paris, Leonardo da Vinci's masterpiece 'The Mona Lisa' is recovered inside Italian waiter Vincenzo Peruggia's hotel room in Florence (more info)

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