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Almost everyone on Earth now breathes polluted air, according to an air quality map released Tuesday by the World Health Organization.

Conditions in the embattled rebel-held eastern part of Aleppo are getting worse each day. There's no way in or out. Residents in the city are increasingly desperate to tell the world what's happening -- and many have turned to WhatsApp.

Typhoon Megi slammed into the coast of northeast Taiwan on Tuesday, injuring dozens and leaving almost a million homes without power.

During the first presidential debate, Hillary Clinton said Donald Trump thinks global warming was created by and for the Chinese in order to make U.S. manufacturing non-competitive.

"Typhoons are normally nothing but a disaster," says Atsushi Shimizu.

Interviewing the late former Israeli President Shimon Peres on the occasion of his 90th birthday, I asked him what it takes to be a good leader.

Every year, Dindim the Magellanic penguin wobbles into the backyard of a home on Provetá Beach in Ilha Grande, Brazil. Without fail, he comes back in what scientists believe is a sense of loyalty to a man who rescued him when he was at his worst.

Donald Trump told his supporters Tuesday night that he was "holding back" during his first debate against Hillary Clinton because he "didn't want to do anything that embarrassed her."

Former "Miss Universe" Alicia Machado said Trump called her "Miss Piggy" and "Miss Housekeeping." She talks to CNN's Anderson Cooper about how the presidential nominee treated her.

Hillary Clinton was making a point about Donald Trump and women at the first presidential debate when she brought up Alicia Machado, the former Miss Universe who says Donald Trump insulted her.

Trump sniffles, Hillary shimmies and the internet laughs. CNN's Jeanne Moos reports.

In August 2014, Iraqi forces and Kurdish Peshmerga fighters set out on a mission to help Yazidi people trapped on Mount Sinjar.

CNN's Miguel Marquez watched the first presidential debate with a body language expert who analyzed Donald Trump and Hillary Clinton.

Senate Democrats blocked Tuesday a Republican bill to fund the government and battle Zika because it did not include money for Flint, Michigan, to address the city's drinking water crisis.

Attention Facebook users: Brad Pitt isn't dead, and clicking on that post could give a hacker control of your account.

The FBI has asked to examine the cellphones of a small number Democratic Party staffers as it investigates a possible hack of cellphones, law enforcement and Democratic Party sources told CNN Tuesday.

President Barack Obama on Tuesday tapped the highest-ranking US diplomat in Cuba as the first ambassador to the island in more than 50 years. But deep opposition among some senators means it's nearly impossible he'll be confirmed before the President leaves office.

After 30 years in the spotlight, Hillary Clinton finally found the balance on gender that has bedeviled her throughout her career during the debate at Hofstra Monday night.

CNN commentators and guest analysts offer their take on Monday night's presidential candidate debate. The opinions expressed in these commentaries are solely those of the authors.

Tyson Foods is voluntarily recalling more than 130,000 pounds of cooked chicken nuggets because they may contain hard plastic, the US Department of Agriculture's Food Safety Inspection Service said Tuesday.