Two astronomers argue that the farthest objects in the Kuiper Belt are being pushed and pulled by the gravity of Planet Nine, a giant planet orbiting over 10 times farther from the Sun than Neptune. If they find it, it’ll be the first real expansion of the Sun’s planetary album in 170 years.

This robot might look like a Furby. But, using artificial intelligence, it can learn to understand a child's emotional state to better engage them during a lesson.

Bioarchaeologists investigate a ninth-century mass grave in a rural English village. Will the remains unlock the mystery of the “Great Heathen Army,” a legendary Viking fighting force that once invaded England?

Archaeologists discovered a mass grave of what they thought to be ninth-century Vikings. But for some reason, the radiocarbon dates of their bones, found by measuring a radioactive carbon isotope, appeared much older.

This Viking’s skeleton, which was buried alongside weapons and horses, was found in 1889. Over a century later, archaeologists still assumed the skeleton was that of a high-status male warrior. But DNA analysis revealed the surprising truth.

Horse riding played a key role in human expansion and civilization. But when and how did people first master these animals? Scientists use archeology and genetics to uncover clues about the first horse riders and how they shaped the world.

Anthropologist and filmmaker Niobe Thompson attempts to milk a horse, and discovers that the process is a lot more difficult than it sounds. Milking a mother horse, he explains, is all about tricking her. The process begins by having her foal suckle. Then, the foal is taken away and a human rushes in to take its place. But if the mother horse suspects anything is different, things can go awry.

Paradise, California's Camp Fire accelerated as it moved uphill. U.S. Department of Agriculture scientists conduct an experiment to discover why.

The California wildfires of 2018 took a worrisome trend to a new extreme, claiming scores of lives and over a million acres. Scientists investigate how forestry practices, climate change, and drought may contribute to the rise of deadly megafires.

As the Camp Fire scorches a community in Northern California, residents leave by car and on foot. Their journey is captured on harrowing cell phone videos.

The Camp Fire, which began on Nov. 8, 2018, was the deadliest and most destructive wildfire in California history to date.

After the largest and deadliest wildfire in California's history to date scorches Paradise, California, a resident returns home and witnesses the Camp Fire's destruction firsthand.

Many Muslim women are not permitted to be home alone with a male who is not a family member, making it tough to schedule home repairs. Now, in Jordan, billions of gallons of already-scarce water is being lost to leaky pipes. In an effort to take matters into their own hands, many Muslim Jordanian women are learning to do their own plumbing.

As the Dead Sea shrinks, engineers prepare a daring solution: connect it with the Red Sea by way of a massive desalination plant. If it works, it could stabilize the legendary lake and ease regional tensions. But will it put the environment at risk?

A mass of fossilized fish, uncovered in North Dakota, appear to preserve the catastrophic fallout of the asteroid impact that wiped out the dinosaurs.

When a ball traveling through the air is spinning, some physics known as the magnus force kicks in to make it bend or curve. The magnitude of the magnus force depends on the ball’s rate of spin as well as its mass, velocity, radius, and the density of the air around it.

How do we see objects? By intercepting waves of light bouncing off of them and into our eyes, each reflected at a different angle. One way to achieve invisibility is to bend the paths of light using lenses, mirrors, or metamaterials with unique reflective properties. There are a lot of problems still to be solved—and valuable applications awaiting those who succeed.

In 2017, scientists were using a telescope in Chile to hunt for Planet X, thought to be far beyond Pluto. But Jupiter came into view along with 12 never-before-seen moons, bringing the gassy giant’s current total moon count to an astonishing 79.