Geoff Brumfiel

Joyce Ann Kraner is eager for the pandemic to end and for life to get back to normal. Kraner, 49, wants to be able to hug her mother, who lives in a nursing home.

But she says she has no plans to get the vaccine, even though it's widely available in her community of Murfreesboro, Tenn. "I feel like I'm healthy," she says.

For months, Iran has slowly been violating terms of a 2015 deal designed to limit its nuclear program. It has been accumulating enriched uranium, which can be used for nuclear reactors or, potentially, nuclear weapons. It's been ramping up its research and development.

But until recently, there was one thing Iran didn't touch: the nuclear inspections conducted by the International Atomic Energy Agency.

When NASA's Perseverance rover touched down on the Martian surface last week, humans cheered from the confines of planet Earth.

But if the space agency or others hope to leave and send astronauts to Mars, experts say they need to consider a technology that was studied decades ago but never fully developed: nuclear-powered rockets.

Updated at 10 p.m. ET

House Speaker Nancy Pelosi has asked the Pentagon's leadership to limit President Trump's ability to use nuclear weapons during his final days in office.

In a letter to her Democratic House colleagues on Friday, Pelosi said that she had spoken with the chairman of the Joint Chiefs of Staff, Gen. Mark Milley, about "available precautions for preventing an unstable president from initiating military hostilities or accessing the launch codes and ordering a nuclear strike."

Updated at 7:48 p.m. ET

Four astronauts lifted off Sunday night from the Kennedy Space Center in Florida aboard a SpaceX rocket bound for the International Space Station.

Liftoff occurred right on schedule at 7:27 p.m., despite concerns about weather earlier in the day. NASA astronauts Mike Hopkins, Shannon Walker, Victor Glover, and Japanese astronaut Soichi Noguchi reached orbit after a 12-minute ride to space.

Updated Oct. 26 at 6:11 p.m. ET

Two new peer-reviewed studies are showing a sharp drop in mortality among hospitalized COVID-19 patients. The drop is seen in all groups, including older patients and those with underlying conditions, suggesting that physicians are getting better at helping patients survive their illness.

Perhaps fittingly for the year 2020, the Nobel Prize in physics has recognized research on black holes.

The prize was awarded to Roger Penrose of the University of Oxford, for demonstrating that the general theory of relativity leads to the formation of black holes; and to Reinhard Genzel of the Max Planck Institute for Extraterrestrial Physics and Andrea Ghez of the University of California, Los Angeles, for the discovery of a compact object at the center of the Milky Way galaxy that governs the orbits of stars, for which a black hole is the only known explanation.

A commercial satellite photo may reveal a new Chinese space plane just moments after it landed at a remote site on the western side of China.

The photo, which is too low resolution to be conclusive, was snapped by the San Francisco-based company Planet. It shows what could be the classified Chinese spacecraft on a long runway, along with several support vehicles lined up nearby.

Dr. Scott Atlas has literally written the book on magnetic resonance imaging. He has also co-authored numerous scientific studies on the economics of medical imaging technology.

New satellite photos show the aftermath of Tuesday's massive, deadly explosion at the port of Beirut.

As the coronavirus continues to spread rapidly throughout the U.S. and beyond, many are wondering: How on earth will this end? In an interview televised this week, President Trump reiterated his belief that sooner or later the virus will burn itself out. "I will be right eventually," the president told Fox News host Chris Wallace. "It's going to disappear, and I'll be right."

Updated at 6:55 p.m. ET

NASA astronauts are heading to space from U.S. soil for the first time in nine years, aboard SpaceX's Dragon capsule, the maiden crewed flight of the innovative spacecraft.

The mission, which is sending Doug Hurley and Bob Behnken to the International Space Station, is a bold new venture for the space agency's plan to allow commercial companies to take its astronauts into low-Earth orbit.

Updated at 5:40 p.m. ET

NASA and SpaceX were ready to launch a pair of astronauts from U.S. soil for the first time in nearly nine years on Wednesday, but the weather had other ideas.

This week, NASA and the commercial company SpaceX are set to launch two astronauts to the International Space Station (ISS) in a new capsule. This is the first launch by NASA of astronauts from U.S. soil in nearly a decade, but it's happening in the middle of a pandemic.

Here are some of the ways that the coronavirus will, and won't, change the plans for the space agency's latest launch.

Astronauts have been quarantining since before it was cool.

If you want to visit the Great Pyramids or the Great Wall or the Taj Mahal, forget it.

Egypt, China and India are just a few of the dozens of countries that have imposed strict travel restrictions to keep visitors, and the coronavirus, out. An analysis by NPR based on data from the International Air Transport Association found that more than three-quarters of the world's nations and territories have suspended travel from at least one other place.

Over the past week, President Trump and his team have repeatedly claimed to have intelligence showing that the new coronavirus accidentally escaped from a lab in China.

Virus researchers say there is virtually no chance that the new coronavirus was released as result of a laboratory accident in China or anywhere else.

The assessment, made by more than half-a-dozen scientists familiar with lab accidents and how research on coronaviruses is conducted, casts doubt on recent claims that a mistake may have unleashed the coronavirus on the world.

Updated at 10 a.m. ET

It's a strange and tragic pattern in some cases of COVID-19: The patient struggles through the first week of illness, and perhaps even begins to feel a little better.

Then suddenly they crash.

The new coronavirus is killing hundreds each day and swamping hospitals around the world. But catching the disease does not mean you will end up in the ICU.

"There are many patients that are fine and that are at home," says Michelle Ng Gong, the chief of critical care medicine at the Montefiore Health System in New York City. Those who don't need a hospital make up "I would dare say, in fact, the vast majority of people," she says.

Stay inside, don't meet with friends, don't go to work — these are the messages coming from public health officials at every level of government. But increasingly, experts say they believe those stark warnings must be augmented with another message:

If you think you might be sick, even a little sick, get tested for coronavirus.

People infected with the coronavirus can spread it easily, even if they're not yet experiencing severe symptoms of the disease, according to virologists watching the pandemic unfold in Europe.

The fragile peace deal taking shape in Afghanistan could spell the end of an era of for the U.S. military, one marked by efforts at nation-building and winning hearts and minds.

It appears that the Pentagon is also intent on ending a research program from that era — to fund social science for the military.

Acclaimed physicist Freeman Dyson, who pondered the origins of life, interstellar travel and many other topics, died Friday at the age of 96.

His daughter Mia Dyson told NPR that her father died after a short illness.

Freeman Dyson was known for groundbreaking work in physics and mathematics but his curiosity ranged far beyond those fields.

The U.S. has begun deploying a new type of low-yield nuclear warhead aboard some ballistic missile submarines, according to a report by an independent monitor.

When the USS Tennessee, an Ohio-class submarine, went on patrol in the final weeks of 2019, it carried "one or two" of the new weapons, according to a post by the Federation of American Scientists.