Read CNN's NATO Fast Facts for a look at the North Atlantic Treaty Organization, headquartered in Brussels, Belgium.

Why do we spring forward and fall back with our clocks each year? Daylight Saving Time was a way to save fuel and make the most of sunlight during World War I, but it has stuck around.

The Biden administration will impose a fresh slate of sanctions on more than 500 targets on Friday in response to opposition figure Alexey Navalny's death and just one day before the two-year anniversary of Russia's invasion.

Alexey Navalny's mother says she has seen his body and is being threatened by investigators into agreeing to a secret funeral. In Ukraine, fierce battles continue in the south and east. Follow for live updates.

Read CNN's Robert Levinson Fast Facts and learn more about the American who went missing in Iran in 2007.

The Odysseus lunar lander, nicknamed "Odie" or IM-1, will attempt to land on the moon on Thursday, marking the first touchdown of a US-made spacecraft on the moon in five decades. Follow for live news updates.

AT&T's network went down for many of its customers across the United States Thursday morning, leaving customers unable to place calls, text or access the internet. Follow for live updates.

Ukrainian forces say they hit a "training ground" for Russian troops on the left bank of the Dnipro River, near the key bridgehead of Krynky in southern Ukraine. Follow for live updates.

Read CNN's Fast Facts on the former US Secretary of Energy and former Texas Governor Rick Perry to learn more about the 2016 presidential candidate.

Read CNN's Fast Facts on major rail accidents since 1900.

Read CNN's Fast Facts about the Daytona 500, the first race of the racing season for NASCAR.

Read CNN's Fast Facts for information about Russian opposition leader, Kremlin critic and activist Alexey Navalny.

Read CNN's Fast Facts about the March 2004 bombings of commuter trains in Spain, which killed 193 people and injured more than 1,800.

Discontent toward Russian President Vladimir Putin in Russian society is on the rise, according to his former speechwriter who noted that Russian success in the eastern town of Avdiivka will be a key factor to "suppress this discontent" and "strengthen Putin's domestic standing" ahead of Russian ele

When ISIS claimed of responsibility for the attack on the Palace of Westminster this week, it was another reminder of the violent and destructive nature of Islamism, or political Islam, as it is sometimes referred to.

Chicago activists and neighbors of a teenage girl whose sexual assault was broadcast on Facebook Live are urging the community to help identify the suspects.

"Rogue One: A Star Wars Story" lands on digital HD Friday. The movie was a blockbuster, but even fans watching it again on a small screen now don't know the whole story behind it.

'Rock and a Hard Place' review Dwayne Johnson lends muscle to HBO documentary about rehab program for at-risk youths

House Intel Committee member Rep. Jim Himes accused Committee Chairman Devin Nunes, a Republican, of persistently serving "the interests of Donald Trump."

Here's what you might have missed on CNN today.

America has a long, perverse history of adoring its Medicare but still holding bitter hatred for government intervention in health care, as Donald Trump is learning now, says Howard Markel.

President Trump has a long history of tweets on deal-making.

Former Egyptian President Hosni Mubarak was freed Friday after a six-year imprisonment following his overthrow during the Arab Spring.

There were two constants in Egypt on January 24, 2011; the flow of the Nile and President Hosni Mubarak would die in office. The 30-year rule of Egypt's "Modern Pharaoh" appeared to be secure, shored up by the feared State Security. Any anti-government protests were corralled into pens surrounded by

View the Oil Spills Fast Facts on CNN and learn more information about oil spill disasters.

The former Colombian ambassador to the U.S. pushes back against allegations that donations to the Clinton Foundation swayed an important 2011 trade deal.

Investment, not dining trivia, should be central to 2016 debate.

These fabulous new properties will make you want to rethink your upcoming holiday plans.

He might flaunt his outrageous wealth at every opportunity, but there's another -- more surprising -- side to undefeated boxing champion Floyd Mayweather.

Democratic presidential contender Martin O'Malley returned to his riot-scarred home city of Baltimore on Tuesday after canceling a series of paid speeches in Ireland.

Freddie Gray was remembered Monday in Baltimore at a packed church

'Lizzie McGuire' actor Jake Thomas reunited with former costars Lalaine and Hilary Duff and the Internet cheered.

Conor McDonnell, the photographer behind Instagram's most liked image, shares his five top tips to gain followers and take great photos on the go.

Rep. Elijah Cummings said it's up to adults across the United States to improve the education their cities provide — otherwise "Baltimore can happen anywhere."

Power has been restored at the Metropolitan Detention Center in Brooklyn, New York, where inmates spent several days without heat or lighting, according to a statement from the Bureau of Prisons.

The daily rate of long-acting reversible contraceptive insertions increased 21.6% in the 30 days after Donald Trump was elected president, compared with the 30 days before, according to new research.

Gannett, the nation's largest newspaper chain and the publisher of USA Today, rejected a takeover bid by MNG Enterprises, the hedge fund-owned company also known as Digital First Media, on Monday.

Legendary investor Bill Gross, the onetime king of the bond market, announced plans on Monday to retire after more than four decades in finance.

Democratic Rep. Alexandria Ocasio-Cortez of New York has invited Ana Maria Archila to be her guest at President Donald Trump's State of the Union address.

Several senior Senate Republicans and members of GOP leadership raised serious concerns Monday about the possibility of President Donald Trump bypassing Congress and using an emergency declaration to build a border wall with Mexico.

Climate change will melt a third of the ice in the Himalayas even if the goals of the Paris climate agreement are met, a new report finds. And that's a serious threat to the 240 million people who live in the Hindu Kush Himalaya region and the 3 billion who rely on food produced in the area.

When we adopt a pet, we learn about their normal environment, activity level and nutrition. Isn't it interesting that we do not apply that to the animal we live in? To feel normal, we should live normal, and a human's normal life is that for which she or he has evolved.

Allbirds sneakers, which have been dubbed "the world's most comfortable shoe," live up to the claim.

Although most famous leaning towers are historical structures, even modern buildings can start to tilt -- and it's a difficult problem to fix.

George W. Bush left the White more than five years ago but that would be hard to tell if you have been listening to Hillary Clinton over the last month.

Raymond Offenheiser says a new Oxfam study shows workers in every congressional district would benefit from a minimum wage hike. So why the partisan stalling?

Debbie Plotnick says incidents like James Boyd's death might be avoided if more police were trained to deal with the mentally ill

Paul Saffo says with the Fire Phone, Amazon shifts the focus of mobile device to satisfying our shopping urges.

Dan Ronayne thinks that the new carbon emission standards could work against Democrats this year and in 2016

Nathaniel Morris, who's reading President Obama's 2008 campaign memoir, says it highlights the promises that haven't been achieved