William Broad

Suspicions have focused on the Wuhan Institute of Virology, which long gathered bat viruses and whose laboratories conducted experiments on them.

The mountaineer Vanessa O’Brien dove to the Challenger Deep, seven miles below the surface of the sea.

A study suggests that ultraviolet rays could slow the virus, though not enough to wipe it out, and not as a treatment.

Victor Vescovo claims to have set the record for the deepest ocean descent by a human. The director of ‘Titanic’ demands to differ.

The size, scope and sophistication of North Korea’s atomic program mean its dismantling would be far and away the most challenging in nuclear history.

Long ago, the region lay under an ice sheet thousands of feet thick. It terminated abruptly in what are now the boroughs, leaving the city with a unique landscape.

Despite a long record of intelligence warnings, there is no evidence that Washington has ever moved with urgency to cut off Pyongyang’s access to a rocket fuel.

Unusually large test explosions like Sunday’s North Korean blast can be achieved in many ways, making the field of atomic forensics difficult for distant experts.

Theories abound as to why the deadly nerve agent was not used during World War II, which could have dealt a major blow to the Allies, who didn’t know about the lethal arms.

In a letter, physicists and other nuclear experts emphasized progress made in slowing Iran’s ability to purify uranium, a main fuel for nuclear arms.

The image, a symbol of a city’s destruction that has been considered the moment a nuclear bomb hit, is actually of smoke from fires that followed.

The goal is to learn how to better deflect comets and asteroids that might one day endanger cities or the planet as a whole.

Russia acquired not just a peninsula, but a maritime zone and the rights to tap its seabed for oil and gas reserves potentially worth trillions of dollars.

The United States has been working to dispose of its chemical weapons for decades, a process complicated by concerns about public health and the environment.

James Cameron, who rode the Deepsea Challenger into the sea’s deepest spot last year, hopes the donation to the Woods Hole Oceanographic Institution will speed ocean exploration.

When “The Science of Yoga” was published a year ago, my Iyengar teacher told me the book would start a conversation. The reality was more like a riot.

Scientists have discovered that whales can “close” their ears, decreasing their sensitivity to noises underwater.

James Cameron of “Avatar” fame emerged safe and sound from a perilous trip 6.8 miles down in the Pacific.

There are many ways to mark the 100th anniversary of the world’s most famous shipwreck, but time is running out for a submersible trip to the deep.

General Electric’s success with a half-century-old idea for enriching nuclear fuel more easily, using lasers, has critics worried that rogue states might use the method to make bomb fuel.