Geoff Brumfiel

Jeff Bezos announced that he will make a brief trip into space next month. The launch could herald a new era of space tourism.

President Biden told U.S. intelligence agencies to investigate whether the coronavirus spread after a lab leak in China. Scientists welcome the request, but many still think it came from the wild.

Leading U.S. officials have renewed calls for a deeper investigation into the origins of the coronavirus outbreak.

Researchers say the herd immunity threshold isn't the right finish line to end the pandemic. Instead, the public should just focus on getting as many people vaccinated as possible.

The idea of herd immunity has been sold to the public as the way out of the pandemic. Some medical experts say the idea is probably not that useful in terms of understanding how the pandemic ends.

The coronavirus pandemic has created an opening for vaccine opponents to peddle alternative therapies, unproven cures and website subscriptions.

It seems like computers are getting smaller all the time. Now some companies are betting big on new ones that run at the atomic level — tiny machines that could have a huge impact.

The company's third crewed spacecraft took off from Florida early Friday.

One in four Americans say they won't get a coronavirus vaccine. Researchers say it could keep the nation from reaching a critical tipping point.

Vaccines have created a way out of the COVID-19 pandemic, but public health experts are worried that hesitancy and misinformation may stop the U.S. from reaching the goal of herd immunity.

Nuclear inspections have been a key part of the Iran nuclear deal. International inspectors stand to permanently lose access to key sites, unless the U.S. and Iran can find a way forward.

In 1721, London was in the grips of a deadly smallpox epidemic. One woman learned how to stop it, but her solution sowed political division.

Nuclear power is potentially dangerous. So is sending humans to Mars. But some researchers think a nuclear-powered rocket might be the best way to travel to the red planet.

Nuclear rocket technology might be the fastest, safest way to get to the red planet. But if NASA wants to go, it should start development now.

A new global treaty banning nuclear weapons will go into force on Friday. More than 80 countries have signed on to it — but none of them are countries that have nuclear weapons.

The House speaker told colleagues she had spoken with the chairman of the Joint Chiefs of Staff about keeping the nuclear codes from an "unhinged President."

This has been a tough year for pretty much everyone on Earth. But things have been going much better in space. One of the big milestone was for NASA and the commercial company SpaceX.

A Chinese probe has blasted off from the surface of the moon, carrying the first moon rock samples collected in over 40 years.

The killing of a top Iranian scientist last week will likely complicate efforts to restart the Iran nuclear deal. Will Iran really throw out nuclear weapons inspectors?

Three missions from Earth are currently headed to Mars. But some scientists are saying it's time to go to Venus, despite all the challenges in heading to Earth's toxic, volcanic planetary neighbor.