Sam Gringlas

Updated at 11:42 a.m. ET

In the final sprint before Tuesday's New Hampshire primary, Democratic presidential candidates are taking a more sharply negative tone about their rivals than they have up until now.

The top target is former South Bend, Ind., Mayor Pete Buttigieg. He faced a barrage of attacks as the other Democratic candidates seek to blunt his momentum from a strong showing in Iowa.

A Chilean military plane with 38 people on board has crashed on its way to Antarctica, Chile's air force said Tuesday.

Air force officials say they have not been able to locate the Hercules C-130 transport, but based on the number of hours it has been missing, have determined it likely crashed. A search and rescue mission is ongoing, The Associated Press reports.

Why the Trump administration delayed nearly $400 millions of dollars in security aid to Ukraine is the question at the heart of the impeachment inquiry into President Trump.

Democrats say the president tried to coerce an ally to help him take down a political opponent. Republicans argue it's a routine use of presidential power.

Interviews with current and former officials show how the Trump administration's hold-up of aid to Ukraine was irregular and likely violated U.S. law, and has far-reaching consequences at home and overseas.

The annual Harvard-Yale football game was delayed for almost an hour on Saturday as climate change activists rushed the field at the end of halftime.

Unfurling banners with slogans like "Nobody wins. Yale and Harvard are complicit in climate injustice," protesters from both schools called on the universities to divest their multi-million dollar endowments from fossil fuels companies, as well as companies that hold Puerto Rican debt.

In the industrial city of Dongguan, China, the effects of the trade war on the Chinese economy are measured in idled machinery and empty bar stools.

"One year ago, you probably couldn't even get through the crowd because it would be so busy. But right now, even the smallest vendors can't survive," says Song Guanghui, the owner of Crowdbar, a tricked-out food stall in an open-air market in Dongguan.

Seventy years ago, Mao Zedong appeared on a balcony overlooking Tiananmen Square and conjured a new country into being. On Tuesday, Xi Jinping, arguably the strongest leader since Mao, appeared on that same balcony to reaffirm his vision of modern China.

That vision includes what Xi has repeatedly referred to as the "Chinese Dream," one pillar of which is the idea that all Chinese should have access to the shared prosperity of the nation.

As a kid, Enrique Olvera spent hours in his grandmother's bakery in Mexico City. He loved watching everyday ingredients like flour, sugar and eggs fuse into something entirely different.

For Olvera, even the simple act of baking a cake felt like magic.

He absorbed every detail as his grandmother gently coaxed masa into handmade tortillas. On Sundays, he joined his father in the kitchen, chopping onions and tomatoes for breakfasts of scrambled eggs and dry beef.

More than a decade ago, Anaïs Mitchell was running late for one of her shows. The singer-songwriter, in her 20s at the time, was trying to get from one gig to another and found herself lost. Along the drive, a song lyric popped into her head. "The lines that came were, 'Wait for me I'm coming. In my garters and pearls with what melody did you barter me from the wicked underworld,'" she remembers.

Unemployment is at nearly 50-year lows and the economy has been adding jobs for 97 straight months. But, 10 years after the financial crisis, the recovery hasn't reached everywhere.

Three members of a Michigan family had all worked at a General Motors plant near Detroit before it closed in 2010, as the economy and the auto industry collapsed around them. All three lost their jobs at the factory. And their lives changed in unexpected ways.

Don Skidmore: GM plant closing was 'like losing your life'

The night before one of the biggest rallies in Washington, D.C., history, Sam Zeif is beat.

It's been a long day. It started with an early-morning hit on CNN, then another with ABC's Good Morning America, followed by an afternoon trip to MSNBC — not for the first time. Just two days earlier, he was in Los Angeles, filming a segment with Ellen DeGeneres.

Wednesday is Valentine's Day, and if you struggled to find just the right words to tell a special someone how you feel, you have options.

There are the classic options: Store-bought superhero valentines or sappy Hallmark cards. Or if you're into something sweet — boxes of pastel-colored candy hearts, emblazoned with messages like "BE MINE," "XOXO" and "HOT STUFF."

But if those candy greetings feel tired, or just aren't striking the right note, Colorado researcher Janelle Shane has some ideas.

Lea esta historia en español.

The day was going to be perfect.

Alex figured he would wake up at 6:30 a.m., help get his little brothers up and off to school and catch the bus by 7. After school, the 14-year-old would do something he had been looking forward to for weeks — play in his first football game.