Without any natural predators, invasive lionfish populations grow unchecked and wreak havoc on marine ecosystems. Watch free divers hunt these poisonous fish.

Lionfish–long prized in home aquariums–have invaded the Atlantic, and are now one of the ocean’s most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to find out how they took over, why they’re doing so much damage, and what can be done about it.

The upcoming launch of NASA’s Artemis I is a big step toward sending humans back to the moon for the first time in 50 years. Discover what scientists hope this launch could mean for the future of space travel.

Psychedelics might interact with the brain by turning off the brain’s default mode network and affecting a thin sheet of gray matter called the claustrum. This could shake up communication between different regions of the brain.

Peyote is an important medicinal plant that is used in rites of passage and in religious and healing ceremonies in Indigenous communities.

Hallucinogenic drugs—popularly called psychedelics—have been used by human societies for thousands of years. Today, scientists are taking a second look at many of these mind-altering substances – both natural and synthetic – and discovering that they can have profoundly positive clinical impacts, helping patients struggling with a range of afflictions from addiction to depression and PTSD.

A machine learns from what’s programmed into it—and sometimes, that reinforces historical, discriminatory practices.

Here's how scientists developed a once-a-day pill that reduced the risk of sexually transmitted HIV transmission by 99%, a breakthrough that transformed the course of the HIV/AIDS epidemic.

Could we deflect an asteroid barreling toward Earth? NASA’s DART mission--the first test of its kind--showed that we may be able to knock an asteroid off its path, if we ever need to.

The deadliest part of a hurricane isn’t the wind–it’s water. Here’s what causes a storm surge, and which regions are most at risk.

These computer programs use artificial intelligence to look for patterns in data without human instruction.

In police departments and courts across the country, artificial intelligence is being used to help decide who is policed, who gets bail, how offenders should be sentenced, and who gets parole. But is it actually making our law enforcement and court systems fairer and more just? This timely investigation digs into the hidden biases, privacy risks, and design flaws of this controversial technology.

The water used to fight a fire at Paris’s iconic Notre Dame Cathedral and months of rainwater damaged the Cathedrals’ stonework but a team of geologist have a plan to save it.

After the fire, the team working on restoring the South Rose window noticed major changes to the original stained glass masterpiece.

In April 2019, the world watched as a devastating fire almost destroyed Paris’s iconic Notre Dame Cathedral. Go behind the scenes with a team of engineers, masons, and timber workers tackling the daunting challenges of restoring the historic landmark.

Tiger sharks are being spotted off the coast of the New England earlier than usual, and they’re hanging around for longer. What's going on? And are they here to stay.

Venice is sinking, with sea level predicted to rise another 40 inches by the end of the century. Could a colossal network of flood barriers save it from the sea?

Building a city on a lagoon has its challenges. Here's how the citizens of Venice accomplished this task centuries ago.

Rising seas and sinking land threaten to destroy Venice. Can the city’s new hi-tech flood barrier save it? Discover the innovative projects and feats of engineering designed to stop this historic city from being lost to future generations.

Almost 40 years after the discovery of HIV, could we be on the verge of ending the AIDS epidemic in America? How did scientists tackle one of the most elusive deadly viruses to ever infect humans? Can innovative drugs bring new infections to zero?