Nature: How To Raise a Genius

Lessons From a 45-year Study of Super-Smart Children.

A long-running investigation of exceptional children reveals what it takes to produce the scientists who will lead the twenty-first century.

On a summer day in 1968, professor Julian Stanley met a brilliant but bored 12-year-old named Joseph Bates. The Baltimore student was so far ahead of his classmates in mathematics that his parents had arranged for him to take a computer-science course at Johns Hopkins University, where Stanley taught. Even that wasn’t enough. Having leapfrogged ahead of the adults in the class, the child kept himself busy by teaching the FORTRAN programming language to graduate students.

Unsure of what to do with Bates, his computer instructor introduced him to Stanley, a researcher well known for his work in psychometrics — the study of cognitive performance. To discover more about the young prodigy’s talent, Stanley gave Bates a battery of tests that included the SAT college-admissions exam, normally taken by university-bound 16- to 18-year-olds in the United States.

Bates’s score was well above the threshold for admission to Johns Hopkins, and prompted Stanley to search for a local high school that would let the child take advanced mathematics and science classes. When that plan failed, Stanley convinced a dean at Johns Hopkins to let Bates, then 13, enroll as an undergraduate.

Stanley would affectionately refer to Bates as “student zero” of his Study of Mathematically Precocious Youth (SMPY), which would transform how gifted children are identified and supported by the US education system. As the longest-running current longitudinal survey of intellectually talented children, SMPY has for 45 years tracked the careers and accomplishments of some 5,000 individuals, many of whom have gone on to become high-achieving scientists. The study’s ever-growing data set has generated more than 400 papers and several books, and provided key insights into how to spot and develop talent in science, technology, engineering, mathematics (STEM) and beyond.

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National Geographic: How Can 6 Million Acres at Denali Still Not Be Enough?

The icon of Alaska’s wilderness symbolizes the tension between preservation and use at U.S. national parks.

PARK RANGERS here call the high season—from June through early September, when Denali National Park and Preserve hosts the majority of its 500,000 annual visitors—the “hundred days of chaos.” Indeed a midsummer morning at the park’s Wilderness Access Center, located at the start of Denali’s fabled 92-mile-long Park Road, can feel a bit like rush hour at Manhattan’s Port Authority Bus Terminal. Loudspeakers announce bus boarding times, and visitors from many nations crowd the ticket counter.

Most of Denali’s visitors are cruise ship passengers who see the park and its prolific wildlife largely through bus windows. “But if you’re seeking solitude, it’s not hard to find,” says ranger Sarah Hayes, who helps backpackers and hikers prepare for their adventures. “We’ve got six million acres of mostly trailless lands where wild animals roam undisturbed. And it’s accessible to anyone who hops off the bus.”

Picture of mantis shrimp eyeAs my bus rolls out, noses press against windows, hands clutch cameras, and people speaking half a dozen different tongues excitedly speculate about wildlife sightings. I ask several passengers what’s on their wish list. “A moose!” “A grizzly!” “Caribou!” “A wolf!”

At the five-mile mark we spot our first animal. “Squirrel!” a kid yells, bringing the bus to laughter. After the 15-mile mark, the road turns to dirt and empties of cars. A few miles farther along the trees disappear. As the distant peaks of the Alaska Range come into view, the scale of this kingdom of nature becomes apparent. The driver slows down.

“It’s been hiding for two weeks now,” he says, wheeling the vehicle through a tight turn. “But there’s a pretty good chance that today …” As the towering mountain comes into hazy view, a dozen voices sing out, “Denali!”

At the five-mile mark we spot our first animal. “Squirrel!” a kid yells, bringing the bus to laughter. After the 15-mile mark, the road turns to dirt and empties of cars. A few miles farther along the trees disappear. As the distant peaks of the Alaska Range come into view, the scale of this kingdom of nature becomes apparent. The driver slows down.

“It’s been hiding for two weeks now,” he says, wheeling the vehicle through a tight turn. “But there’s a pretty good chance that today …” As the towering mountain comes into hazy view, a dozen voices sing out, “Denali!”

Rising 20,310 feet above sea level, North America’s tallest peak is a stunning sight, although in warm weather its slopes are often shrouded in clouds. The mountain was a big part of the legend and lore of the Athabaskan-speaking people who gave it the name Denali, meaning Tall One. In 1896 gold prospector William Dickey renamed it Mount McKinley in honor of Ohio politician William McKinley, a staunch champion of the gold standard who one year later would become the nation’s 25th president. For decades Ohio’s congressional delegation successfully blocked attempts to rename the mountain. Then last summer the Obama Administration used its executive power to restore the original name.

Seeing the mountain, spotting a grizzly, or catching a glimpse of a wolf are the top three reasons people give for coming to Denali. As recently as 2010, a visitor stood a better chance of seeing a wolf in the wild than seeing the elusive Tall One, which is visible on just one in three summer days. But since 2010 the number of wolf sightings has plunged. According to a study of wildlife viewing opportunities along the Park Road, observers recorded wolf sightings on only 6 percent of trips in 2014—down from 45 percent in 2010. Park biologists report that the number of wolves inside the park has dropped from more than 100 a decade ago to fewer than 50 last year. I came to Denali, in part, to discover why.

“I hate to call the weatherman a liar, but there’s no way it was 30 below zero down there,” pilot Dennis Miller says, as our ski-plane climbs away from the snowy airstrip at park headquarters. Bundled in half a dozen layers and wedged behind him in the tiny cockpit, I watch Miller shake his head. “I’ll be surprised if it gets that warm all day,” he says.

A few minutes later we hear the day’s first radio-collared wolf in our left headphones, as an antenna on the plane’s left side picks up its signal. Miller turns the aircraft and the beeps equalize, left and right. The chirping gets louder as we cross the park boundary and fly over the Stampede corridor, a notch of state, borough, and private land also known as the Wolf Townships.

“That’ll be the female in the East Fork pack,” Miller says. “Back in November we counted at least 15 wolves, but we found the collared male dead two weeks ago, on March 6. I’ve only seen a single set of tracks since then.”

They come here to snap a few pictures and get some bragging rights about being 50 feet from a grizzly … They go away wanting to protect places like this.

Following the signal, Miller descends and zigzags through a river valley where a lone wolf track heads into the trees. He throws the plane over on its left wingtip and peers down. “I’m just going to make one pass,” he says, pulling the plane tighter into the turn and squinting toward the ground. “Some of the guys in these houses here, if they see me circling, they’ll come out and try to find what I’m looking at and shoot it.”

I’ve spent the previous four days flying with Miller and National Park Service biologists, whose focus turns to wolves during the snowy, light-filled days of March. Each time they’ve spotted a wolf inside the park that they want collared, they’ve called in a helicopter team to swoop down and dart it. With the animal tranquilized, biologists fit it with a collar. They also take blood and hair samples, hoping to fill some of the many gaps in what we know about the health, behavior, and genetics of one of the world’s most misunderstood animals.

The research is an extension of the pioneering work of ecologist Adolph Murie, one of the first scientists to study Denali’s wolves in the wild. In 1939, when Murie made the first of his many expeditions to what was then Mount McKinley National Park, wolves were considered vermin, and Park Service rangers had a history of shooting them on sight. Murie’s research showed that wolves and other top predators play an essential role in healthy habitats, and he argued that we should manage parks to protect entire ecosystems rather than individual species

Other influential scientists and thinkers would follow Murie to Denali, whose wide-open and mostly treeless mountainscapes are ideal for observing wildlife. This sprawling swath of still wild America would inspire and anchor many of the lofty ideals now considered part of the DNA of the National Park Service and incite great shifts in thinking on the role of parks and their protectors. It was here that many of the now accepted values of environmental protection and science-based decision-making gestated. The Wilderness Act has roots here, and the seeds of some of the nation’s most influential environmental initiatives were planted here.

Denali has also had an outsize impact on the hundreds of thousands of nonscientists who arrive each year with dreams of a thrilling wildlife encounter and depart with a much deeper connection with the natural world. “We see it all the time,” says Park Superintendent Don Striker. “They come here to snap a few pictures and get some bragging rights about being 50 feet from a grizzly. In the course of experiencing this natural drama, something clicks. They go away wanting to protect places like this.”

Yet Denali has always been an uneasy paradise. The park was created in 1917 as a refuge for Dall sheep and other game animals, and its first rangers found themselves chasing poachers who supplied meat to miners and railroad builders. This tug-of-war between use and preservation would become the fundamental tension of the national parks. Even today there are few places where it’s felt as intensely, or dealt with as creatively, as it is here. The tension extends from Denali’s sometimes crowded summit to its remote traplines. It reaches from the skies surrounding the mountain, which often buzz with sightseeing flights, down to the ears of solitude seekers in the trailless valleys below.

“A lot of things about this park are confusing to people,” says ranger John Leonard. “It’s wilderness, but then people are landing planes in some places and hunting and trapping in others. That’s the difference with Denali—it’s not locked up. And that’s what makes it so challenging to manage.”

 “Was that you flying around the other day in a red-and-white Super Cub?” Coke Wallace asks when we meet outside his home on Stampede Road. “We thought maybe you guys were radio tracking a wolf. I almost went over to see if there was anything I could shoot.”

Wallace is a trapper, hunter, guide, and self-described “extreme right-wing redneck.” As he shows me his extensive collection of traps and snares and a very large wolf hide stretched over a drying rack, he gets a call on his mobile phone. Its ringtone is a wolf’s howl.

“Contrary to popular opinion, I don’t hate wolves,” he tells me. “In fact, I think they’re cool as hell. Only problem is, every five to seven years I catch the wrong wolf.”

In 1999 Wallace shot a collared alpha female in the Grant Creek pack, which had been highly visible to visitors on the Park Road. In 2005 he caught the East Fork pack’s alpha female in a trap set just outside the park boundary. In 2012 he dragged a horse carcass to a site where wolves were active and set traps and snares around it. When he returned a few days later, he’d trapped a pregnant female belonging to the East Fork pack. The kill, documented by a neighbor and later confirmed by Wallace, landed him in the Los Angeles Times and generated both death threats and a boost for his guiding business. That same year Wallace caught the only remaining breeding female in the Grant Creek pack, which often roamed just outside the park boundary. The pack consequently produced no pups and fell from 15 members to 3.

“That was the third time I ruined millions of people’s Denali National Park viewing experience,” Wallace quips.

Until a few years ago a wolf that strayed near Wallace’s turf would have been off-limits. But Denali’s most vulnerable wolf packs are at the center of some ugly politics. In 2000 Gordon Haber, the celebrated and outspoken wolf biologist who continued Adolph Murie’s research, observed trappers laying snares along the park’s boundary. He joined with others and persuaded the Alaska Board of Game to establish a no-kill buffer zone along the Stampede Trail and in the Nenana Canyon area. After Haber died in a plane crash in late 2009, the Park Service requested an expansion of the protected area. The board responded by eliminating it completely, making wolves vulnerable to trapping and hunting all around the park boundary.

“We increased it twice, but it was never big enough,” explains Sam Cotten, commissioner of the Alaska Department of Fish and Game. “The last proposal was for another significant increase, and the feeling was that the federal government created that border and that’s the line. So we went back to a harder boundary.”

Although the Park Service halted its predator control decades ago, the state has ramped up its wolf reduction program in some areas in an effort to boost caribou and moose populations.

“Food security for our subsistence users is a primary driver,” says Cotten. “When we don’t meet objectives for populations of ungulates like moose and caribou, we have to consider culls of predators.”

In 2013 and 2014 state predator-control agents and authorized private hunters, shooting from aircraft, killed dozens of wolves just outside Yukon-Charley Rivers National Preserve. The cull reduced the preserve’s wolf population by more than half and killed several collared wolves that had been part of a decades-long Park Service study. Although Cotten says the wolf-culling programs are based on sound science, some data undermine the premise that killing wolves leads to increased prey populations, particularly in the long term.

To Wallace, the wolf culls and the removal of Denali’s buffer zones were long overdue. “It’s the state standing up to an overreaching federal government and libtard environmentalists,” he says. “I liked the park much better as McKinley National Park, when it was for sheep. Then the feds crammed that whole ANILCA thing down our throats.”

In 1980 the U.S. Congress passed the Alaska National Interest Lands Conservation Act. It designated 104 million acres as national parks, forests, and preserves and protected 50 million more acres as wilderness. Mount McKinley National Park was renamed Denali National Park and Preserve, and expanded from 2 million acres to 6 million. Property rights were retained throughout the preserve, as were hunting and trapping rights in some sections.

It’s good politics to hate the parks and to overlook all the good they’ve done for the state, especially economically.

ANILCA is widely considered among the most important conservation victories in U.S. history, but many Alaskans saw it as the culmination of years of federal overreach. Wallace was a teenager in Fairbanks when protesters there burned an effigy of President Jimmy Carter, who in 1978 elevated 56 million acres in Alaska to national monument status. In 1979 residents of towns near the park organized the Great Denali Trespass, marching into the park to shoot guns, light fires, and commit other acts of protest.

“Every other place I’ve been, they love their national park,” says Superintendent Striker, who managed five parks in the lower 48 before coming to Denali. “But here the relationship is so poisoned by the past. People don’t realize this was always federal land—it was never the state’s. It’s good politics to hate the parks and to overlook all the good they’ve done for the state, especially economically.”

The debate—and everything else—seems far away when I poke my head through the tent flap at a campsite near Cache Creek in mid-March. It’s the third morning of a mushing expedition and also the third morning with temperatures of minus 20 degrees Fahrenheit. I think about retreating back under the canvas, but Denali—visible most days in winter—catches my eye. Above the valley rays of sunlight splash the Tall One’s summit and northeastern flanks with a dazzling orange glaze.

When I finally muster the gumption to emerge from the tent, heads turn. Thirty or so sled dogs that had been yawning in their dug-out nests of snow rise and begin to yelp and howl eagerly. Dog teams are still an integral part of backcountry management here during the winter, patrolling the park’s boundaries, supporting wildlife research, and hauling supplies for cleanups and cabin restorations. And Denali’s hands-on summer kennel show is the most popular demonstration program offered by the park’s staff.

“The dogs connect people to history and to an experience most people will never have,” says kennel manager Jennifer Raffaeli. “In the winter they’re the most reliable and reasonably safe way to move around parts of the park. Unlike a snowmobile, they’re always ready to start up. They also have a survival instinct, which is something no machine can ever have.”

That afternoon the cold snap breaks, and we mush in a caravan of three dog teams to the ranger station at Wonder Lake. At 2 a.m. we step outside our cabins to catch a dazzling show of the aurora borealis as the dogs sleep nearby.

“A lot of Denali is untouchable to most people, but with the dogs, traveling like this, you can touch it,” Raffaeli tells me as we stare in awe at the curtains of multicolored light flowing across the sky. “The sense of peace you get here in the winter is so intense it’s almost beyond belief.”

Three months later, in late June, I experience a completely different Denali. It’s 8 p.m. on the Park Road, and I’m stuck in a traffic jam. As a moose cow and two calves make their way languidly along the tree line, drivers stop in the middle of the road to point cameras.

In the 1960s Adolph Murie fought hard against plans to pave a highway into the heart of the park. He achieved a partial victory when the Park Service decided to pave only the first 15 miles. But as visitor numbers increased, the narrow road became more crowded and dangerous, and concerns grew about the impact of traffic on wildlife. In 1972 Denali became one of the first of America’s national parks to set up a mass transit system to reduce the number of cars—an approach that has since been copied at other parks.

I spend a week roaming through Denali’s summer backcountry, soaking up the clarifying power of wilderness. Toward the end of my trek I score a short stay in the East Fork Cabin, Murie’s base while he researched the relationship between wolves and sheep. For the young ecologist, it was a dream come true. He had solitude and the chance to study animals with the simplest of tools: binoculars, a camera, notebooks, and strong legs. His focus was an extended family of wolves ranging near the cabin at the east fork of the Toklat River.

Murie’s bosses in Washington, D.C., may have expected a dry research monograph. What he gave them instead was The Wolves of Mount McKinley, a classic work of natural history. Published in 1944, the book-length report brought the Toklat-East Fork pack to the world’s attention. Murie described, for the first time, wild wolves’ life cycles and relationships and the workings of an entire ecological network. Realizing that the interactions were more complicated than anyone had imagined, Murie began working to change policies that called for the eradication of predators such as wolves, mountain lions, and coyotes.

That stance made him unpopular both inside and outside the Park Service. But the more he wrote about the subjects of his research in magazines and journals, the more popular the “First Family” of American wolves became. Wildlife lovers began to travel up from the lower 48 to see them, and wolves became one of Denali’s signature attractions.

On my way to the cabin the bus driver asked her passengers, “Back home, how many of you feel like every hour is rush hour?” I didn’t raise my hand, reluctant to admit that the never ending race against the clock has, for much of my adult life, gotten the best of me—and that for many years I’ve dreamed of breaking free of human-calibrated time.

I awake from a nap late that afternoon. Reflexively, I move to check my phone, then catch myself. Here there is no possibility of a text or call. The clock is no longer in command. I spend three days around the cabin—hiking, reading Murie’s work, and adapting, as Emerson put it, to the “pace of nature.” As I hike back toward the road, I’m not looking forward to rejoining the bustling bus scene or catching up on the news of the world.

Even the news from inside the park isn’t good. I drop by park biologist Steve Arthur’s office to ask about the preliminary results of the latest studies of wolf population numbers (still low) and the findings of a necropsy on a bloodied wolf carcass I saw during my winter visit. Arthur’s team had dug the frozen wolf—an East Fork male—out of the snow and discovered a snare around its neck. The animal had managed to pull the snare free of its anchor, then wandered into the park and bled to death.

In May, Arthur got a call from a hunter who had legally shot a collared wolf near a bear-bait station on the Stampede Trail, just outside the park. In 2012 state game officials had expanded the controversial practice of bear baiting (which is banned in most states that allow bear hunting) to include grizzly bears. The spring baiting season overlaps wolf breeding season, making it more likely that pregnant or nursing females will be killed.

After five weeks in Denali—walking, skiing, flying, mushing, and bus riding through the extremes of winter and summer—I have time for one last venture into the wilderness. From a rear seat on the backpackers’ bus I spot a promising route leading over a rise, then down toward the Toklat River.

I trot into the trailless landscape without a map, half hoping to get lost among the mountains and tarns. Reaching the river, I spot a hanging valley on the other side that looks much closer than it actually is. What started as a half-day hike stretches past eight hours, which is fine with me—I’ve got all the daylight I need. Walking back toward the road, I flush a golden eagle from a high overlook and realize that I’ve been walking far more quietly than is smart in bear country. As soon as I open my mouth to speak, I top a rise and look down on a large male grizzly cooling off in a pond about 200 yards below me. When my voice reaches him, he rises on his hind legs and looks around, comically. He’s a big guy, but he’s not a troublemaker. He wades to shore and climbs out of the water, stopping to shake himself dry before sauntering slowly up the mountain and out of sight.

I flag down the bus a final time and step aside for a solo backpacker who’s chosen this spot to disembark. He has a four-day pack on his back and a laminated map in his hand. I ask him where he’s heading. He sweeps his map across the vista of mountains and valleys and rivers and sky, his eyes crinkling into a smile as he takes in a range of possibilities broad enough to be a world unto itself.

“Out there somewhere,” he says.

National Geographic: Yukon: Canada’s Wild West

A modern-day minerals rush threatens North America’s last great wilderness.


Shawn Ryan recalls the hungry years, before his first big strike.

The prospector and his family were living in a metal shack on the outskirts of Dawson, the Klondike boomtown that had declined to a ghostly remnant of its glory days. They had less than $300 and no running water or electricity. One night, as wind sneaked through gaps in the cladding, Ryan’s wife, Cathy Wood, worried aloud that their two children might even freeze to death.

Today the couple could buy—and heat—just about any house on Earth. Ryan’s discovery of what would eventually amount to billions of dollars’ worth of buried treasure has helped reinfect the Yukon with gold fever, and fortune seekers have stormed the Canadian territory in numbers not seen since the 1890s. The minerals rush has reanimated Dawson’s weather-tilted bars and bunkhouses, whose facades glow in pastel hues during midsummer’s late-night sunset. The scene could be from more than a century ago, with bearded men bustling along wooden sidewalks and muddy streets, hooting and trading rumors of the latest strikes and price spikes. Inside Diamond Tooth Gerties casino, miners mingle with tourists and cancan girls, thronging four deep around beer taps and poker tables.

During the first Klondike stampede prospectors plied nearby creeks with picks and pans and shovels, and a bartender could sweep up a small fortune in spilled gold dust at the end of a big night. Nowadays mining’s heavy lifting is done by a mechanized army of bulldozers, drilling rigs, and flown-in workers. The claim-staking boom has cooled since the price of gold has stabilized, but an ongoing high demand for minerals and the Yukon’s industry-friendly regulations continue to attract mining companies from as far away as China.

At Shawn Ryan’s expanding compound at the edge of town, helicopters thump overhead, fetching GPS-equipped prospectors to and from remote mountain ridges. Ryan is 50 years old, but he radiates the eagerness and intensity of a much younger man. “This is the biggest geochemical exploration project on the planet right now,” he says, his grin revealing a couple of missing upper teeth, “and maybe in history.”

Along the Porcupine River caribou have been a mainstay of the Vuntut Gwitchin people for at least 10,000 years. Now development is threatening their traditional way of life.

Along the Porcupine River caribou have been a mainstay of the Vuntut Gwitchin people for at least 10,000 years. Now development
is threatening their traditional way of life.

In the modular office he calls his war room, radios and bear-spray canisters surround a trio of computer screens atop a plywood table. A self-taught geologist, Ryan uses the left-hand screen to display the colored maps he generates from his ever growing database of soil samples, looking for anomalies that might betray a hidden body of precious ore. On the center screen a blue grid overlays a map of the Yukon, showing the claims he currently owns; since 1996 he and his crews have staked more than 55,000 claims, enough to cover a landmass larger than Jamaica. Ryan uses the right-side screen to track his gold-related holdings, which notch up in value whenever an economic jolt sends investors fleeing to precious metals.

As the material needs of the world’s seven billion people continue to grow, the rush to exploit the Yukon’s exceptionally rich resources—gold, zinc, copper, and more—has brought prosperity to a once forsaken corner of the continent. But the boom has brought to the fore a growing tension between those who would keep one of North America’s last great wildernesses unbroken and those whose success depends on digging it up.

“They’re blanket-staking the whole territory,” says Trish Hume, a member of the Champagne and Aishihik First Nations. Though Hume does mapping work that’s mining related, she worries that the Yukon is reaching a tipping point where the environmental and cultural costs of mining outweigh the benefits. “The people coming up and taking out minerals aren’t asking what happens to the animals we hunt, the fish we eat, the topsoil that holds it all together. And when the boom is over, how does our tiny population afford to clean up the toxic mess?”

Read the rest of the story at National Geographic

Tom on Snake Rapids

Author Tom Clynes smacks into a wave train on the Yukon’s Snake River, part of the pristine Peel River watershed. Peter J. Mather photo.


Click any photo to see a slide show of images from the Yukon Territory.







Popular Science: The Battle Over Climate Science

Climate scientists routinely face death threats, hate mail, nuisance lawsuits and political attacks. How much worse can it get?

There’s no police tape across Michael Mann’s office doorway this morning. “Always a good start,” he says, juggling a cup of coffee as he slides his key into the lock.

Mann, a paleoclimatologist, wears a sport coat over a turtleneck. As he takes a seat at his desk, a narrow sunbeam angles through the window, spotlighting a jumble of books, journals and correspondence. Behind him, a framed picture of his six-year-old daughter rests near a certificate for the Nobel Peace Prize he shared in 2007. Propped into a corner is a hockey stick, a post-lecture gift from Middlebury College, which Mann jokingly says he keeps “for self-defense.”

Mann directs Penn State University’s Earth System Science Center. Several months ago, he arrived at his office with an armload of mail. Sitting at his desk, he tore open a hand-addressed envelope and began to pull out a letter. He watched as a small mass of white powder cascaded out of the folds and onto his fingers. Mann jerked backward, letting the letter drop and holding his breath as a tiny plume of particles wafted up, sparkling in the sunlight. He rose quickly and left the office, pulling the door shut behind him. “I went down to the restroom and washed my hands,” he says. “Then I called the police.”

For someone describing an anthrax scare, Mann is surprisingly nonchalant. “I guess,” he says, “it’s so much a part of my life that I don’t even realize how weird it is.”

“Weird” is perhaps the mildest way to describe the growing number of threats and acts of intimidation that climate scientists face. A climate modeler at Lawrence Livermore National Laboratory answered a late-night knock to find a dead rat on his doorstep and a yellow Hummer speeding away. An MIT hurricane researcher found his inbox flooded daily for two weeks last January with hate mail and threats directed at him and his wife. And in Australia last year, officials relocated several climatologists to a secure facility after climate-change skeptics unleashed a barrage of vandalism, noose brandishing and threats of sexual attacks on the scientists’ children.

Read the rest of the story at Popular Science