WASHINGTON (AP) — The ancient ritual meaning of Stonehenge is still a mystery, but researchers are one step closer to understanding how the famous stone circle was created.

The unique stone lying flat at the center of the monument was brought to the site in southern England from near the tip of northeast Scotland, researchers reported Wednesday in the journal Nature. It’s not clear whether the 16-foot (5-meter) stone was carried by boat or across land — a journey of more than 460 miles (740 kilometers).

“It’s a surprise that it’s come from so far away,” said University of Exeter archaeologist Susan Greaney, who was not involved in the study.

For more than a hundred years, scientists believed that Stonehenge’s central sandstone slab — long called the “altar stone” — came from much closer Wales. But a study last year by some of the same researchers showed that the stone didn’t match the geology of Wales’ sandstone formations. The actual source of the stone remained unknown until now.

For the study, the team was not permitted to chip away rocks at the site, but instead analyzed minerals in bits of rock that had been collected in previous digs, some dating back to the 1840s. They found a match in the sandstone formations of Orcadian Basin in northeast Scotland, a region that includes parts of the tip of the Scottish peninsula as well as the Orkney Islands.

“That geological ‘fingerprint’ isn’t repeated in any other area of sediment in the U.K.,” said Aberystwyth University geologist Nick Pearce, a study co-author.

Greaney said the difficult logistics of moving the stone such a long distance show a high level of coordination and cultural connection between these two regions of ancient Britain.

Stonehenge was constructed around 5,000 years ago, with stones forming different circles brought to the site at different times. The placement of stones allows for the sun to rise through a stone “window” during summer solstice. The ancient purpose of the altar stone — which lies flat at the heart of Stonehenge, now beneath other rocks — remains a mystery.

“Stonehenge isn’t a settlement site, but a place of ceremony or ritual,” said Heather Sebire, senior curator at English Heritage, who was not involved in the study. She said that past archaeological excavations had not uncovered evidence of feasting or daily living at the site.

Previous research has shown cultural connections — such as similarities in pottery styles — between the area around Stonehenge and Scotland’s Orkney Islands. Other stones at Stonehenge came from western Wales.

While Britain is dotted with other Neolithic stone circles, “the thing that’s unique about Stonehenge is the distance from which the stones have been sourced,” said Aberystwyth University’s Richard Bevins, a study co-author.

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The annual meteor shower, active since July, peaks before dawn Monday. It’s one of the brightest and most easily viewed showers of the year, producing “bright blue meteors — and lots of them,” said University of Warwick astronomer Don Pollacco.

More than 50 meteors per hour are expected, according to the American Meteor Society. The shower lasts through Sept. 1.

Here’s what to know about the Perseids and other meteor showers.

What is a meteor shower?

Multiple meteor showers occur annually and you don’t need special equipment to see them.

Most meteor showers originate from the debris of comets. The source of the Perseids is the comet 109P/Swift-Tuttle.

When rocks from space enter Earth’s atmosphere, the resistance from the air makes them very hot. This causes the air to glow around them and briefly leaves a fiery tail behind them — the end of a “shooting star.”

The glowing pockets of air around fast-moving space rocks, ranging from the size of a dust particle to a boulder, may be visible in the night sky.

The Perseids result from “bigger particles than a lot of other showers,” said NASA’s Bill Cooke, giving them the appearance of “bright fireballs” — easier to spot than many others.

How to view a meteor shower

Meteor showers are usually most visible between midnight and predawn hours.

It’s easier to see shooting stars under dark skies, away from city lights. Meteor showers also appear brightest on cloudless nights when the moon wanes smallest.

The Northern Hemisphere will have the best view of the Perseids. This year’s peak coincides with a moon around 44% full.

When is the next meteor shower?

The meteor society keeps a list of upcoming large meteor showers, including the peak viewing days and moonlight conditions.

The next major meteor shower will be the Orionids, peaking in mid-October.

The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

The names are one part of elephants’ low rumbles that they can hear over long distances across the savanna. Scientists believe that animals with complex social structures and family groups that separate and then reunite often may be more likely to use individual names.

“If you’re looking after a large family, you’ve got to be able to say, ‘Hey, Virginia, get over here!’” said Duke University ecologist Stuart Pimm, who was not involved in the study.

It’s extremely rare for wild animals to call each other by unique names. Humans have names, of course, and our dogs come when their names are called. Baby dolphins invent their own names, called signature whistles, and parrots may also use names.

Each of these naming species also possesses the ability to learn to pronounce unique new sounds throughout their lives — a rare talent that elephants also possess.

For the study in Nature Ecology & Evolution, biologists used machine learning to detect the use of names in a sound library of savanna elephant vocalizations recorded at Kenya’s Samburu National Reserve and Amboseli National Park.

The researchers followed the elephants in jeeps to observe who called out and who appeared to respond — for example, if a mother called to a calf, or a matriarch called to a straggler who later rejoined the family group.

Analyzing only the audio data, the computer model predicted which elephant was being addressed 28% of the time, likely due to the inclusion of its name. When fed meaningless data, the model only accurately labeled 8% of calls.

“Just like humans, elephants use names, but probably don’t use names in the majority of utterances, so we wouldn’t expect 100%,” said study author and Cornell University biologist Mickey Pardo.

Elephant rumbles include sounds that are below the range of human hearing. The scientists still don’t know which part of the vocalization is the name.

Researchers tested their results by playing recordings to individual elephants, who responded more energetically, ears flapping and trunk lifted, to recordings that contained their names. Sometimes elephants entirely ignored vocalizations addressed to others.

“Elephants are incredibly social, always talking and touching each other — this naming is probably one of the things that underpins their ability to communicate to individuals,” said co-author and Colorado State University ecologist George Wittemyer, who is also a scientific adviser for nonprofit Save the Elephants.

“We just cracked open the door a bit to the elephant mind.”

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

The Eta Aquarids occur every year in early May. This year’s peak activity happens early Sunday with an expected 10 to 30 meteors visible per hour in the Northern Hemisphere. Viewing should be even better in the Southern Hemisphere. The shower lasts through May 27.

Here’s what to know about the Eta Aquarids and other meteor showers.

What is a meteor shower?

Multiple meteor showers occur annually and you don’t need special equipment to see them.

Most meteor showers originate from the debris of comets. The source of the Eta Aquarids is Halley’s comet.

When rocks from space enter Earth’s atmosphere, the resistance from the air makes them very hot. This causes the air to glow around them and briefly leaves a fiery tail behind them — the end of a “shooting star.”

The glowing pockets of air around fast-moving space rocks, ranging from the size of a dust particle to a boulder, may be visible in the night sky.

How to view a meteor shower

Meteor showers are usually most visible between midnight and predawn hours.

It’s easier to see shooting stars under dark skies, away from city lights. Meteor showers also appear brightest on cloudless nights when the moon wanes smallest.

The Southern Hemisphere will have the best view of Eta Aquarids, but a waning moon just 14% full will allow for clear viewing in both hemispheres, according to the American Meteor Society.

When is the next meteor shower?

The meteor society keeps an updated list of upcoming large meteor showers, including the peak viewing days and moonlight conditions.

The next big one is the Southern Delta Aquarid meteor shower, which peaks in late July.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

Scientists observed Rakus pluck and chew up leaves of a medicinal plant used by people throughout Southeast Asia to treat pain and inflammation. The adult male orangutan then used his fingers to apply the plant juices to an injury on the right cheek. Afterward, he pressed the chewed plant to cover the open wound like a makeshift bandage, according to a new study in Scientific Reports.

Previous research has documented several species of great apes foraging for medicines in forests to heal themselves, but scientists hadn’t yet seen an animal treat itself in this way.

“This is the first time that we have observed a wild animal applying a quite potent medicinal plant directly to a wound,” said co-author Isabelle Laumer, a biologist at the Max Planck Institute of Animal Behavior in Konstanz, Germany.

The orangutan’s intriguing behavior was recorded in 2022 by Ulil Azhari, a co-author and field researcher at the Suaq Project in Medan, Indonesia. Photographs show the animal’s wound closed within a month without any problems.

Scientists have been observing orangutans in Indonesia’s Gunung Leuser National Park since 1994, but they hadn’t previously seen this behavior.

“It’s a single observation,” said Emory University biologist Jacobus de Roode, who was not involved in the study. “But often we learn about new behaviors by starting with a single observation.”

“Very likely it’s self-medication,” said de Roode, adding that the orangutan applied the plant only to the wound and no other body part.

It’s possible Rakus learned the technique from other orangutans living outside the park and away from scientists’ daily scrutiny, said co-author Caroline Schuppli at Max Planck.

Rakus was born and lived as a juvenile outside the study area. Researchers believe the orangutan got hurt in a fight with another animal. It’s not known whether Rakus earlier treated other injuries.

Scientists have previously recorded other primates using plants to treat themselves.

Bornean orangutans rubbed themselves with juices from a medicinal plant, possibly to reduce body pains or chase away parasites.

Chimpanzees in multiple locations have been observed chewing on the shoots of bitter-tasting plants to soothe their stomachs. Gorillas, chimpanzees and bonobos swallow certain rough leaves whole to get rid of stomach parasites.

“If this behavior exists in some of our closest living relatives, what could that tell us about how medicine first evolved?” said Tara Stoinski, president and chief scientific officer of the nonprofit Dian Fossey Gorilla Fund, who had no role in the study.

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Fossils found near a coal mine revealed a snake that stretched an estimated 36 feet (11 meters) to 50 feet (15 meters). It’s comparable to the largest known snake at about 42 feet (13 meters) that once lived in what is now Colombia.

The largest living snake today is Asia’s reticulated python at 33 feet (10 meters).

The newly discovered behemoth lived 47 million years ago in western India’s swampy evergreen forests. It could have weighed up to 2,200 pounds (1,000 kilograms), researchers said in the journal Scientific Reports.

They gave it the name Vasuki indicus after “the mythical snake king Vasuki, who wraps around the neck of the Hindu deity Shiva,” said Debajit Datta, a study co-author at the Indian Institute of Technology Roorkee.

This monster snake wasn’t especially swift to strike.

“Considering its large size, Vasuki was a slow-moving ambush predator that would subdue its prey through constriction,” Datta said in an email.

Fragments of the snake’s backbone were discovered in 2005 by co-author Sunil Bajpai, based at the same institute, near Kutch, Gujarat, in western India. The researchers compared more than 20 fossil vertebrae to skeletons of living snakes to estimate size.

While it’s not clear exactly what Vasuki ate, other fossils found nearby reveal that the snake lived in swampy areas alongside catfish, turtles, crocodiles and primitive whales, which may have been its prey, Datta said.

The other extinct giant snake, Titanoboa, was discovered in Colombia and is estimated to have lived around 60 million years ago.

What these two monster snakes have in common is that they lived during periods of exceptionally warm global climates, said Jason Head, a Cambridge University paleontologist who was not involved in the study.

“These snakes are giant cold-blooded animals,” he said. “A snake requires higher temperatures” to grow into large sizes.

So does that mean that global warming will bring back monster-sized snakes?

In theory, it’s possible. But the climate is now warming too quickly for snakes to evolve again to be giants, he said.

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WASHINGTON (AP) — Astronomers have found three previously unknown moons in our solar system — two additional moons circling Neptune and one around Uranus.

The distant tiny moons were spotted using powerful land-based telescopes in Hawaii and Chile, and announced Friday by the International Astronomical Union’s Minor Planet Center.

The latest tally puts Neptune at 16 known moons and Uranus at 28.

One of Neptune’s new moons has the longest known orbital journey yet. It takes around 27 years for the small outer moon to complete one lap around Neptune, the vast icy planet farthest from the sun, said Scott Sheppard, an astronomer at the Carnegie Institution for Science in Washington who helped make the discovery.

The new moon orbiting Uranus, with an estimated diameter of just 5 miles (8 kilometers), is likely the smallest of the planet’s moons.

“We suspect that there may be many more smaller moons” yet to be discovered, he said.

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WASHINGTON (AP) — Scientists have mapped the largest coral reef deep in the ocean, stretching hundreds of miles off the U.S. Atlantic coast.

While researchers have known since the 1960s that some coral were present off the Atlantic, the reef’s size remained a mystery until new underwater mapping technology made it possible to construct 3D images of the ocean floor.

The largest yet known deep coral reef “has been right under our noses, waiting to be discovered,” said Derek Sowers, an oceanographer at the nonprofit Ocean Exploration Trust.

Sowers and other scientists, including several at the National Oceanic and Atmospheric Administration, recently published maps of the reef in the journal Geomatics.

The reef extends for about 310 miles (499 kilometers) from Florida to South Carolina and at some points reaches 68 miles (109 kilometers) wide. The total area is nearly three times the size of Yellowstone National Park.

“It’s eye-opening — it’s breathtaking in scale,” said Stuart Sandin, a marine biologist at the Scripps Institution of Oceanography, who was not involved in the study.

The reef was found at depths ranging from 655 feet to 3,280 feet (200 meters to 1,000 meters), where sunlight doesn’t penetrate. Unlike tropical coral reefs, where photosynthesis is important for growth, coral this far down must filter food particles out of the water for energy.

Deep coral reefs provide habitat for sharks, swordfish, sea stars, octopus, shrimp and many other kinds of fish, the scientists said.

Tropical reefs are better known to scientists — and snorkelers — because they’re more accessible. The world’s largest tropical coral reef system, the Great Barrier Reef in Australia, stretches for about 1,430 miles (2,301 kilometers).

Sowers said it’s possible that larger deep-sea reefs will be discovered in the future since only about 25% of the world’s ocean floor has been mapped in high-resolution. Only 50% of U.S. offshore waters have been mapped. Maps of the ocean floor are created using high-resolution sonar devices carried on ships.

Deep reefs cover more of the ocean floor than tropical reefs. Both kinds of habitat are susceptible to similar risks, including climate change and disturbance from oil and gas drilling, said Erik Cordes, a marine biologist at Temple University and co-author of the new study.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

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This story was first published on January 18, 2024. It was updated on January 19, 2024 to correct how much of the ocean floor has been mapped in high-resolution. It is 25%, not 75%.

The species Gigantopithecus blacki, which once lived in southern China, represents the largest great ape known to scientists — standing 10 feet tall and weighing up to 650 pounds.

But its size may also have been a weakness.

“It’s just a massive animal – just really, really big,” said Renaud Joannes-Boyau, a researcher at Australia’s Southern Cross University and co-author of the study published in the journal Nature. “When food starts to be scarce, it’s so big it can’t climb trees to explore new food sources.”

The giant apes, which likely resembled modern orangutans, survived for around 2 million years on the forested plains of China’s Guangxi region. They ate vegetarian diets, munching on fruits and flowers in tropical forests, until the environment began to change.

The researchers analyzed pollen and sediment samples preserved in Guangxi’s caves, as well as fossil teeth, to unravel how forests produced fewer fruits starting around 600,000 years ago, as the region experienced more dry seasons.

The giant apes didn’t vanish quickly, but likely went extinct sometime between 215,000 and 295,000 years ago, the researchers found.

While smaller apes may have been able to climb trees to search for different food, the researchers’ analysis shows the giant apes ate more tree bark, reeds and other non-nutritious food.

“When the forest changed, there was not enough food preferred by the species,” said co-author Zhang Yingqi of China’s Institute of Vertebrate Paleontology and Paleoanthropology.

Most of what scientists know about the extinct great apes comes from studying fossil teeth and four large lower jaw bones, all found in southern China. No complete skeletons have been found.

Between around 2 and 22 million years ago, several dozen species of great apes inhabited Africa, Europe and Asia, fossil records show. Today, only gorillas, chimpanzees, bonobos, orangutans and humans remain.

While the first humans emerged in Africa, scientists don’t know on which continent the great ape family first arose, said Rick Potts, who directs the Human Origins Program at the Smithsonian’s National Museum of Natural History and was not involved in the study.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.