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

A rare Oval Office address from President Obama is among the stories we're following today.

Good morning. Here are some of the stories we're following today:

1. Obama to Nation: Keep Calm and Carry On

In a rare address from the Oval Office, President Barack Obama sought to comfort Americans after last week's mass shooting in San Bernardino and last month's terror attack in Paris. Obama reassured the country that the U.S. is equipped to meet the dangerous and "evolving" threat of terrorism. Obama also cautioned against a ground war against ISIS and briefly touted stricter gun control. Read more in NEWS.

2. FBI Looking Into Mother of San Bernardino Shooter

Attorney General Loretta Lynch said Sunday that the FBI is looking into the mother of Syed Farook, who with his wife gunned down 14 people in San Bernardino last week. Meanwhile, Obama ordered a review of the "fiancée" visa program that Farook's wife, Tashfeen Malik, used to enter the country. Back in Malik's native Pakistan, those who knew her said she always seemed overwhelmingly ordinary. Read more in NEWS.

3. Man Charged in London Subway Stabbings

Muhaydin Mire, 29, will appear in a British court Monday after he was charged with attempted murder in connection with a knife attack at a London subway station that left at least two people injured. Police said they are treating the Saturday attack as a terrorist incident. Read more in NEWS.

4. Justice Department to Investigate Chicago Police

The Justice Department will open an investigation of the Chicago Police Department following the videotaped police killing of 17-year-old Laquan McDonald last year — a shooting that already is under investigation. The broader probe will examine whether Chicago police have engaged in a pattern or practice of violating the civil rights of residents. Read more in NEWS.

5. 7.2-Magnitude Earthquake Shakes at Least 4 Countries

A 7.2-magnitude earthquake struck the Central Asian nation of Tajikistan on Monday and also shook buildings in Afghanistan, Pakistan and India. A spokesman for Tajikistan's Emergencies Committee told Reuters that authorities did not yet have information on possible casualties or damage from the quake. Read more in NEWS.

6. Venezuela's Opposition Defeats Socialists in Landslide

Venezuela's opposition won control of the National Assembly in a landslide Sunday, grabbing the majority from the socialists after their nearly 17-year rule. Seats are still up-for-grabs, but if the opposition wins enough of them and gains a two-thirds majority, the party could challenge President Nicolas Maduro's level of power. Read more in NEWS.

7. President Jimmy Carter Says Cancer Is Gone

Former President Jimmy Carter said Sunday that an MRI scan earlier in the week showed his brain cancer is gone. Carter, 91, was met with gasps and applause when he announced the good news to attendees of a Sunday school class he regularly teaches at Maranatha Baptist Church in Georgia. Read more in NEWS.

Nightly Spotlight: Colombia Finds Treasure-Laden Spanish Galleon

Colombia announced the discovery of a Spanish galleon that was sunk by a British warship three centuries ago, filled with treasure that might be worth as much as $1.5 billion.