Imagine receiving a test result that tells you your body is biologically five years older than your chronological age. You exercise regularly, get good sleep, eat healthy meals and have a happy personal life. What have you been doing wrong? Can this test be trusted?

Dozens of companies are marketing products that promise to reveal a ...Read more

Somewhere between 5% and 7% of U.S. households have rooftop solar panels. Many more Americans want them, but high costs, building locations and landlord restrictions are key obstacles.

As someone who has designed and evaluated a wide range of building energy efficiency technologies, including integrated photovoltaic systems, I know ...Read more

Not all earthquake faults behave the same. Some stick and snap, causing earthquakes. Others move slowly over time.

For years, the leading explanation for slow-moving faults has been that high-pressure fluids along the fault lubricate it, allowing the slabs to slide steadily rather than building up stress until that stress is ...Read more

As the nation observes its 250th birthday, historians can help settle one present-day dispute: Is the United States a democracy or a republic?

For years, advocates have argued the point.

Yet the question itself is misleading. It assumes that the categories constructed by political theorists neatly describe actual practice.

...Read more

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to CuriousKidsUS@theconversation.com.

Why do you have to wear a helmet when you’re skateboarding? – Artie, age 13, Queens, New York

Back when I was 13, I was an avid skateboarder – the kickflip was my go-to...Read more

DENVER — The U.S. Department of Justice last week demanded Denver end its longstanding ban on assault weapons and threatened to sue should officials fail to comply, prompting defiance from city leaders who on Monday vowed to defend the decades-old municipal law.

“Denver’s law has stood for 37 years because it works, it saves lives and it ...Read more

SACRAMENTO, Calif. — A man who was shot seven times by immigration agents in Patterson and then charged with using his car as a deadly weapon pleaded not guilty in Sacramento federal court Monday.

Carlos Ivan Mendoza Hernandez appeared in court in a wheelchair, with a foam block supporting his wounded arm. In a sign, perhaps, of the ...Read more

What began as an expedition voyage from Argentina’s southern tip has turned into a medical emergency at sea, with a suspected hantavirus outbreak killing three passengers and leaving others critically ill as the ship remains blocked from docking in Cabo Verde.

Authorities in the West African island nation have denied the MV Hondius permission...Read more

The U.S. Supreme Court issued a temporary stay on an appeals court ruling from Friday that was blocking remote access to an abortion drug, restoring access until at least May 11.

The administrative stay, issued by Justice Samuel Alito, pauses Friday’s decision by the 5th Circuit Court of Appeals. That ruling blocked a 2023 rule adopted by the...Read more

WASHINGTON — The United States and Iran exchanged fire in the Persian Gulf in a flareup of violence Monday that also drew in the United Arab Emirates, casting doubt on the fate of a four-week ceasefire.

The U.S. military fought off attacks from Iranian drones, missiles and armed small boats as it facilitated the passage of two U.S.-flagged ...Read more

DENVER — The man charged with carrying out an antisemitic terror attack on Boulder’s Pearl Street Mall last year will plead guilty to state charges this week and be sentenced to hundreds of years in prison, his attorneys wrote in a court filing Sunday.

Mohamed Soliman, 46, faces more than 184 charges in Boulder County District Court in ...Read more

WASHINGTON — The Trump administration will renew its effort to change the approach to the nation’s largest homelessness assistance program with a request for funding that will be released next month.

The Department of Housing and Urban Development said it will publish the 2026 Continuum of Care Notice of Funding Opportunity by June 1. The ...Read more

The University of Michigan has denounced a comment made by a faculty leader about the student Israel-Hamas war protesters at Saturday's commencement ceremony after it drew ire from university regents and community members online.

During the ceremony, Faculty Senate Chair Derek Peterson said the student activists had "opened our hearts to the ...Read more

Before authorities charged him with attempting to assassinate President Donald Trump and top administration officials in a brazen attack at the Washington Hilton, Cole Tomas Allen lived what those who knew him described as a quiet, simple existence.

He worked as a tutor and enjoyed video games, manga and riding his blue scooter. Acquaintances ...Read more

TALLAHASSEE, Fla. — Gov. Ron DeSantis on Monday signed into law the congressional map his office created.

DeSantis’ proposal could add four more seats for the Republican Party. It also threatens to dismantle Florida’s Fair Districts Amendment, a voter-approved part of the constitution adopted in 2010.

“Signed, Sealed, and Delivered,”...Read more

Rudy Giuliani remained in critical but stable condition while recovering in a Florida hospital from pneumonia Monday, though he was breathing again without the use of a ventilator, according to his spokesman.

“On September 11th, Mayor Giuliani ran toward the towers to help those in need, which later led to a diagnosis of restrictive airway ...Read more

CHICAGO — Illinois parents are continuing to get their kids vaccinated at high rates despite ongoing controversy nationally about vaccines, according to data released by the state health department Monday.

More than 95% of children statewide had received 10 school-required vaccines as of October, including those against chickenpox, whooping ...Read more

Prime Minister Narendra Modi’s party was set to secure its first-ever election victory in the eastern Indian state of West Bengal, expanding its support base across the country and bolstering his standing as the nation’s most popular leader.

The Bharatiya Janata Party won 50 seats and was leading in 154 seats in vote counting for the state ...Read more

SACRAMENTO, Calif. — The debate over immigration issues has reached a fever pitch nationwide, and Angelica Salas said it's putting her employees at risk.

Salas, executive director of the Coalition for Humane Immigrant Rights, said her staff experiences harassment and death threats.

"They ask themselves, what if someone who disagrees with our...Read more

SAN DIEGO — County supervisors recently voted to hit restart on a proposal to put a 25-acre community park in Alpine, unanimously approving a new environmental impact report after a conservationist lawsuit derailed the project last year.

The county-led effort to secure a community park for the backcountry community has stretched over 30 years...Read more