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The first presidential debate was a tense affair between Hillary Clinton and Donald Trump as they clashed over their economic and trade plans, national security and race relations in the U.S.

The Republican nominee came out aggressively against Clinton, often interrupting her and talking over her, but the Democratic nominee didn't pull her punches either and had plenty of zingers ready. And as the night wore on, Trump appeared repeatedly rattled as he was pressed on his past support for the birther movement and controversial comments about women.

President Barack Obama has signed an order protecting a section of underwater mountains and canyons off New England's coast. It's the first marine national monument in the Atlantic Ocean.

In the last couple years, millions of people across the country have learned their drinking water contains high levels of the contaminants known as perfluorichemicals. These are used to make nonstick things like Teflon and pizza boxes.  And for those with illnesses that are linked to the contaminant, that knowledge can be helpful -- and frustrating.

An epochal transformation in the way energy is made, delivered and used in the U.S. is under way, and in Maine an experiment in what’s called a “non-wires alternative” could disrupt electric utilities’ traditional business models by averting the need to build expensive new transmission infrastructure.

Greg Zupkus stood in the shadow of one his company’s wind turbines. A low hiss came from the turbine’s cooling fan, and in the distance, sporadic gun shots popped off from the adjoining hunting club. But the turbines, surrounded by fields and forest, and turning in the light summer breeze were, for the most part, quiet.

When people hear the word drought, they likely think of California. But there's also an extreme drought in parts of New England. The Northeast is experiencing the worst drought in more than a decade.

Click photos for slideshow.

Cumberland, Rhode Island popped up on a list of cities and towns that have unsafe levels of the chemical perfluorooctanoic acid, or PFOA. It’s used to make Teflon. It turns out those levels have dropped significantly in the town over the past year.

Hillary Clinton accepted her party's nomination on Thursday, completing the field for an American political campaign without historical precedent.

Clinton, the first female presidential nominee for a major American party, has now officially become Republican Donald Trump's Democratic rival for the presidency of the United States.

Democrats called on Americans to reject what they called the politics of fear and division of the GOP and elect Hillary Clinton during the third day of the Democratic National Convention in Philadelphia.

Amid furor over an email leak that revealed a bias against Bernie Sanders inside the Democratic National Committee, U.S. Rep. Debbie Wasserman Schultz announced Sunday she will step down as chair.

Wasserman Schultz will still open and close the convention, she said in a statement, and "address our delegates about the stakes involved in this election not only for Democrats, but for all Americans."

With just one weekend to go before Hillary Clinton is expected to accept her party's nomination for president, WikiLeaks on Friday released almost 20,000 emails sent and received by Democratic National Committee staff members from January 2015 to May 2016 – leaving journalists scouring for information potentially damaging to the party.

It has been said that "to cleave" is the only verb in English that connotes one specific action and its direct opposite. To cleave sometimes means to hold together, and it can also mean to split apart.

That's why Cleveland was the perfect city to host the 2016 Republican National Convention. Because this week, in this town, the GOP demonstrated both its persistent divisions and its instinct for overcoming them.

Researchers at the University of New Hampshire think blue-green algae blooms may be contributing to the declining population of loons in certain New Hampshire lakes.

While scientists have long warned humans to stay clear of algae or cyanobacteria blooms, researchers at UNH now suspect they may be harming New Hampshire’s loon population. While the state’s overall loon population has been steadily rebounding each year, some lakes are still seeing losses.

The campaigns for Hillary Clinton and Bernie Sanders announced in coordinated statements that they will campaign together Tuesday in Portsmouth, N.H.

"On Tuesday, July 12, U.S. Senator Bernie Sanders will join Hillary Clinton for a campaign event at Portsmouth High School to discuss their commitment to building an America that is stronger together and an economy that works for everyone, not just those at the top," said the statement released by both campaigns.

After months of bargaining and backroom arguments, the Senate has voted in favor of a new national standard for labeling food that contains ingredients from genetically modified crops. The essence of the deal: Companies will have to disclose their GMO ingredients, but they won't have to put that information right on the label.

Many food companies are fiercely opposed to such GMO labels because they believe consumers will perceive them — incorrectly — as a warning that those products are nutritionally inferior or even unsafe to eat.

This is a developing story. Last updated 4:15 p.m. ET

Officials say a gunman shot and killed five police officers Thursday at a Dallas protest against police shootings of black men, in a bout of violence that didn't end until the suspected gunman was killed by police using a "bomb robot."

The suspect, who died in a parking garage, was named Micah Xavier Johnson, federal officials told NPR on Friday. Johnson was a military veteran who had served in Afghanistan, and told negotiators he was upset about police shootings and wanted to kill white police officers.

At least 32 people have died at Istanbul's Ataturk International Airport, where an explosion followed an outburst of gunfire Tuesday night, according to Turkish media. Police and emergency personnel have flocked to the airport. More than 80 people were reportedly injured.

Crucial details about the attack are still emerging: We'll update this post with news from Istanbul as it emerges.

Are Your Pipes Made Of Lead? Here's A Quick Way To Find Out

Jun 24, 2016

All the bad news around lead and water has people worried. So we decided to create a step-by-step guide to help find out if the pipe bringing water into your home is made of lead. Get started here.

Updated 2:30 a.m. ET Thursday:

Nearly 15 hours: The Associated Press reports that's how long Connecticut Sen. Chris Murphy and his Democratic colleagues held the floor before yielding early Thursday, with a pledge that he would aggressively press for a legislative response to the Orlando, Fla., mass shooting. Murphy has been upset with congressional inaction on gun violence.

Original Post:

Senate Democrats say they are bringing Senate business to a halt in an effort to force some action on gun control.

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