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Ed Stone, JPL director and top scientist on Voyager mission, dies at 88

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Ed Stone, JPL director and top scientist on Voyager mission, dies at 88

Ed Stone, the scientist who guided NASA’s breakthrough Voyager mission to the outer planets for 50 years and led the Jet Propulsion Laboratory when it landed its first rover on Mars, died Tuesday. He was 88.

A physicist who got in on the ground floor of space exploration, Stone played a leading role in NASA missions to Mars, Jupiter, Saturn, Uranus and Neptune. The discoveries made under his watch revolutionized scientists’ understanding of the solar system and fueled humanity’s ambition to explore distant worlds.

Carolyn Porco, who worked on imaging on JPL’s Voyager and Cassini missions, called Stone “a thoroughly lovely man” who was “as close to perfect as a project scientist could ever be.”

“When two science teams were in contention over some spacecraft resource, and Ed had to decide between the two, even the guy who lost went away thinking, ‘Well, if this is what Ed has decided, then it must be the right answer,’” Porco said by email Tuesday. “I feel blessed to have known Ed. And like many people today, I’m very sad to know he’s gone.”

Stone was a 36-year-old Caltech physics professor in 1972 when he was asked to serve as chief scientist for an audacious plan to send a pair of spacecraft to explore the solar system’s four giant planets for the first time.

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It was the opportunity of a lifetime, but he wasn’t sure he wanted the gig.

“I hesitated because I was a fairly young professor at that point. I still had a lot of research I wanted to do,” he recalled 40 year later.

He took it anyway, and from the mission’s first encounter with Jupiter in 1979 to its final flyby of Neptune in 1989, Stone became the scientific face of the Voyager mission. He guided the science agenda and helped the public make sense of revolutionary images and data not just from Jupiter, Saturn, Uranus and Neptune, but from many of their fascinating moons.

Stone and his more than 200 science collaborators were the first to discover lightning on Jupiter and volcanoes on its moon Io. They spotted six never-before-seen moons around Saturn and found evidence of the largest ocean in the solar system on Jupiter’s moon Europa, as well as geysers on Neptune’s moon Triton.

“It seemed like everywhere we looked, as we encountered those planets and their moons, we were surprised,” Stone told the Los Angeles Times in 2011. “We were finding things we never imagined, gaining a clearer understanding of the environment Earth was part of. I can close my eyes and still remember every part of it.”

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The Voyager 1 spacecraft became the first manmade object to reach interstellar space in 2012, and Voyager 2 followed suit in 2018.

Stone, pictured with a model of the Voyager spacecraft, said the discovery of volcanoes on Io was a highlight of the mission.

(NASA)

The twin probes continue to send weekly communications to Earth from interstellar space. Stone retired in 2022 on the mission’s 50th anniversary.

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“A part of Ed lives on in the two Voyager spacecraft. The fingerprints of his dedication and keen leadership are woven into the Voyager mission,” said Linda Spilker, who joined the mission in 1977 and succeeded him as project scientist.

The Voyager mission was Stone’s crowning achievement, but hardly his only one.

He was a principal investigator on nine NASA missions and a co-investigator on five others, including several satellites designed to study cosmic rays, the solar wind and the Earth’s magnetic field.

He became director of the Jet Propulsion Laboratory in La Cañada Flintridge in 1991, a role he held for a decade.

It was an era of cost-cutting at NASA, but Stone still managed to launch Galileo’s five-year mission to Jupiter and send the Cassini spacecraft to Saturn. He was also at the agency’s helm when Mars Pathfinder delivered the Sojourner rover to the Red Planet. It marked the first time that humans had put a robotic rover on the surface of another planet.

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Throughout his tenure at JPL, Stone continued to work and teach at Caltech, even teaching freshman physics during some of Voyager’s long cruise times between planets.

He also served as chairman of the board of the California Assn. for Research in Astronomy, which is responsible for building and operating the W.M. Keck Observatory and its two 10-meter telescopes on Mauna Kea, Hawaii.

Edward Carroll Stone Jr. was born in Iowa on Jan. 23, 1936, and grew up in Burlington, where his father ran a small construction business and his mother kept the company books.

The eldest of two brothers, Stone was attracted to science from a young age. Under his father’s watchful eye, he learned how to take apart and reassemble all varieties of technology, from radios to cars.

“I was always interested in learning about why something is this way and not that way,” Stone told an interviewer in 2018. “I wanted to understand and measure and observe.”

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After studying physics at Burlington Junior College, he received his master’s and doctorate at the University of Chicago. Shortly after he began his graduate studies, news broke in 1957 that the former Soviet Union had launched Sputnik, the world’s first artificial satellite.

“Just like that, because of the Cold War and our need to match Sputnik, a whole new realm absolutely opened up,” he said.

Stone built a device for measuring the intensity of solar energetic particles above the atmosphere that hitched a ride to space aboard an Air Force satellite in 1961. Unfortunately the spacecraft’s transmitter didn’t work, so only a very limited quantity of data was returned to Earth. However, it was still enough to indicate that the intensity of the particles was lower than expected.

Despite the transmitter glitch, Stone said the project was thrilling. “We were taking the first steps in a whole new area of research and exploration,” he said. “We were right at the beginning.”

He joined the faculty at Caltech in 1964 and created more space experiments, this time for NASA.

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Stone’s particular area of interest was cosmic rays — high-speed atomic nuclei that can originate from explosive events on the sun or from violent events beyond the solar system.

One of his cosmic-ray experiments was included among the 11 major Voyager experiments.

Ed Stone gestures in front of a reddish background

Ed Stone in 2011, about a year before Voyager 1 entered interstellar space.

(Al Seib / Los Angeles Times)

Colleagues praised Stone for his leadership of the Voyager science team.

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“He was a great hero, a giant among men,” said Porco, adding that Stone was known to treat everyone — from top scientists to graduate students — with respect.

Voyager team scientist Thomas Donahue put it this way: “Over the years, Ed Stone has proved to be remarkably adept at keeping a bunch of prima donnas on track.”

Stone was elected to the National Academy of Sciences in 1984 and received the National Medal of Science from President George H.W. Bush in 1991 in recognition of his leadership of the Voyager mission. He won the Shaw Prize in Astronomy in 2019, an honor that comes with a $1.2-million award. In 2012 his hometown of Burlington, Iowa, named its new middle school after him.

“This is truly an honor because it comes from the community where my exploration journey began,” Stone told a local newspaper.

Decades after Voyager’s launch he was asked to select his favorite moment from the mission. He chose the discovery of volcanoes on Jupiter’s moon Io.

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“Finding a moon that’s 100 times more active volcanically than the entire Earth, it’s really quite striking,” he said. “And this was typical of what Voyager was going to do on the rest of its journey through the outer solar system.

“Time after time, we found that nature was much more inventive than our models,” he said.

His wife, Alice, whom he met on a blind date at the University of Chicago and married in 1962, died in December. The couple are survived by their two daughters, Susan and Janet Stone, and two grandsons.

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Q&A: Learn how Olympians keep their cool from Team USA's chief sports psychologist

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Q&A: Learn how Olympians keep their cool from Team USA's chief sports psychologist

Your morning jog or weekly basketball game may not take place on an Olympic stage, but you can use Team USA’s techniques to get the most out of your exercise routine.

It’s not all about strength and speed. Mental fitness can be just as important as physical fitness.

That’s why the U.S. Olympic & Paralympic Committee created a psychological services squad to support the mental health and mental performance of athletes representing the Stars and Stripes.

“I think happy, healthy athletes are going to perform at their best, so that’s what we’re striving for,” said Jessica Bartley, senior director of the 15-member unit.

Bartley studied sports psychology and mental health after an injury ended her soccer career. She joined the USOPC in 2020 and is now in Paris with Team USA’s 592 competitors, who range in age from 16 to 59.

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Bartley spoke with The Times about how her crew keeps Olympic athletes in top psychological shape, and what the rest of us can learn from them. Her comments have been edited for length and clarity.

Why is exercise good for mental health?

It gets you moving. It gets the endorphins going. And there’s often a lot of social aspects that are really helpful.

There are a number of sports that stretch your brain in ways that can be really, really valuable. You’re thinking about hand-eye coordination, or you’re thinking about strategy. It can improve memory, concentration, even critical thinking.

What’s the best way to get in the zone when it’s time to compete?

When I work with athletes, I like to understand what their zone is. If a 0 or a 1 is you’re totally chilled out and a 10 is you’re jumping around, where do you need to be? What’s your number?

People will say, “I’m at a 10 and I need to be at an 8 or a 7.” So we’ll talk about ways of bringing it down, whether it’s taking a deep breath, listening to relaxing music, or talking to your coach. Or there’s times when people say they need to be more amped up. That’s when you see somebody hitting their chest, or jumping up and down.

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If you make a mistake in the middle of a competition, how do you move on instead of dwelling on it?

I often teach athletes a reset routine. I played goalie, so I had a lot of time to think after getting scored on. I would undo my goalie gloves and put them back on, which to me was a reset. I would also wear an extra hairband on my wrist, and when I would snap it, that meant I needed to get out of my head.

It’s not just a physical reset — it helps with a mental reset. If you do the same thing every single time, it goes through the same neural pathway to where it’s going to reset the brain. That can be really impactful.

Do Olympic athletes have to deal with burnout?

Oh, yeah. Everybody has a day where they don’t want to do whatever it is. That’s when you have to ask, “What’s in my best interests? Do I need a recovery day, or do I really need to get in the pool, or get in the gym?”

Sometimes you really do need what we like to refer to as a mental health day.

How can you psych yourself up for a workout when you just aren’t feeling it?

It’s really helpful to think about why you’re doing this and why you’re pushing yourself. Do you have goals related to an activity or sport? Is there something tied to values around hard work or discipline, loyalty or dependability?

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When you don’t want to get in the gym, when you don’t want to go for a run, think about something bigger. Tie it back to values.

Is sleep important for maintaining mental health?

Yes! We started doing mental health screens with athletes before the Tokyo Games. We asked about depression, anxiety, disordered eating and body image, drugs and alcohol, and sleep. Sleep was actually our No. 1 issue. It’s been a huge initiative for us.

How much sleep should we be getting?

It’s different for everyone, but generally we know seven to nine hours of sleep is good. Sometimes some of these athletes need 10 hours.

I highly recommend as much sleep as you need. If you didn’t get enough sleep, napping can be really valuable.

Is napping just for Olympic athletes or is it good for everybody?

Everybody! Naps are amazing.

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What if there’s no time for a nap?

There are different ways of recharging. Naps could be one of them, but maybe you just need to get off your feet for 20 minutes. Maybe you need to do a meditation or mindfulness exercise and just close your eyes for five minutes.

How do you minimize the effects of jet lag?

We try to shift one hour per day. That’s the standard way of doing it. If you can, it’s super helpful. But it’s not always possible.

The thing we tell athletes is that our bodies are incredible, and you will even things out if you can get back on schedule. One or two nights of crummy sleep is not going to impact your overall performance.

What advice do you give athletes who have trouble falling asleep the night before a competition?

You don’t want to change much right before a competition, so I usually direct athletes to do what they would normally do.

Do you need to unwind by reading a book? Do you need to talk on the phone with somebody and get your mind off things? Can you put your mind in a really restful place and think about things that are really relaxing?

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Are there any mindfulness or meditation exercises that you find helpful?

There are some athletes who benefit greatly from an hourlong meditation. I love something quick, something to reset my brain, maybe close my eyes for a minute.

If I’m feeling like I need to take a moment, I love mindful eating. You savor a bite and go, “Oh, my gosh, I have not been fully engaged with my senses today.” Or you could take a mindful walk and take in the sights, the smells, all of the things that are around you.

What do you eat when you need a quick nutrition boost?

Cashews. I tend to carry those with me. They’ve got enough energy to make sure I keep going, physically.

I’ve always got gummy bears on me too. There’s no nutritional value but they keep me going mentally. I’m a big proponent of both.

Is it OK to be superstitious in sports?

It depends how flexible you are. Maybe you put on your socks or shoes a certain way, or listen to certain music. Routines are really soothing. They set your brain up for success in a particular performance. It can be really, really helpful.

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But I’ve also seen an athlete forget their lucky underwear or their lucky socks, and they’re all out of sorts. So your routine has to be flexible enough that you’re not going to completely fall apart if you don’t do it exactly.

Are Olympians made of stronger psychological stuff than the rest of us?

Not necessarily. There are some who don’t get feathers ruffled and have a high tolerance for the fanfare. There’s also a lot of regular human beings who just happen to be fantastic at a particular activity.

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‘Ready, Steady, Slow’: Championship Snail Racing at 0.006 M.P.H.

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‘Ready, Steady, Slow’: Championship Snail Racing at 0.006 M.P.H.
For the next few weeks, Paris will be home to many of the world’s impressive athletes, including some of the fastest human beings on the planet. Among the competitors gathering for the Olympic Games are runners who can knock out a marathon in just over two hours, a mile in under four minutes and 100 meters in less than 10 seconds.

Earlier this month, the rural village of Congham, England, played host to a less likely group of athletes: dozens of garden snails. They had gathered to compete in the World Snail Racing Championships, where the world record time for completing the 13.5 inch course stands at 2 minutes flat. At that speed — roughly 0.006 miles per hour — it would take the snails more than six days to travel a mile.

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Caring for condor triplets! Record 17 chicks thrive at L.A. Zoo under surrogacy method

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Caring for condor triplets! Record 17 chicks thrive at L.A. Zoo under surrogacy method

A new method of rearing California condors at the Los Angeles Zoo has resulted in a record-breaking 17 chicks hatched this year, the zoo announced Wednesday.

All of the newborn birds will eventually be considered for release into the wild under the U.S. Fish and Wildlife Service’s California Condor Recovery Program, a zoo spokesperson said.

“What we are seeing now are the benefits of new breeding and rearing techniques developed and implemented by our team,” zoo bird curator Rose Legato said in a statement. “The result is more condor chicks in the program and ultimately more condors in the wild.”

Breeding pairs of California condors live at the zoo in structures the staff “affectionately calls condor-miniums,” spokesperson Carl Myers said. When a female produces a fertilized egg, the egg is moved to an incubator. As its hatching approaches, the egg is placed with a surrogate parent capable of rearing the chick.

California condor eggs are cared for at L.A. Zoo. The animal is critically endangered.

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(Jamie Pham / L.A. Zoo)

This bumper year of condor babies is the result of a modification to a rearing technique pioneered at the L.A. Zoo.

Previously, when the zoo found itself with more fertilized eggs than surrogate adults available, staff raised the young birds by hand. But condors raised by human caretakers have a lower chance of survival in the wild (hence the condor puppets that zookeepers used in the 1980s to prevent young birds from imprinting on human caregivers).

In 2017, the L.A. Zoo experimented with giving an adult bird named Anyapa two eggs instead of one. The gamble was a success. Both birds were successfully released into the wild.

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Faced with a large number of eggs this year, “the keepers thought, ‘Let’s try three,’” Myers said. “And it worked.”

The zoo’s condor mentors this season ultimately were able to rear three single chicks, eight chicks in double broods and six chicks in triple broods. The previous record number of 15 chicks was set in 1997.

Condor experts applauded the new strategy.

“Condors are social animals and we are learning more every year about their social dynamics. So I’m not surprised that these chick-rearing techniques are paying off,” said Jonathan C. Hall, a wildlife ecologist at Eastern Michigan University. “I would expect chicks raised this way to do well in the wild.”

The largest land bird in North America with an impressive wingspan up to 9½ feet, the California condor could once be found across the continent. Its numbers began to decline in the 19th century as human settlers with modern weapons moved into the birds’ territory. The scavenger species was both hunted by humans and inadvertently poisoned by lead bullet fragments embedded in carcasses it ate. The federal government listed the birds as an endangered species in 1967.

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A condor, one of a record-breaking 17 at the zoo, makes its way out of its shell.

A condor, one of a record-breaking 17 at the zoo, makes its way out of its shell.

(Jamie Pham / L.A. Zoo)

When the California Condor Recovery Program began four decades ago, there were only 22 California condors left on Earth. As of December, there were 561 living individuals, with 344 of those in the wild. Despite the program’s success in raising the population’s numbers, the species remains critically endangered.

In addition to the ongoing threat of lead poisoning, the large birds are also at risk from other toxins. One 2022 study found more than 40 DDT-related compounds in the blood of wild California condors — chemicals that had made their way from contaminated marine life to the top of the food chain.

“Despite our success in returning condors to the wild, free-flying condors continue to face many obstacles with lead poisoning being the No. 1 cause of mortality,” said Joanna Gilkeson, spokesperson for Fish and Wildlife’s Pacific Southwest Region. “Innovative strategies, like those the L.A. Zoo is implementing, help us to produce more healthy chicks and continue releasing condors into the wild.”

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The chicks will remain in the zoo’s care for the next year and a half before they are evaluated for potential release to the wild. Thus far, the zoo has contributed 250 condor chicks to Fish and Wildlife’s program, some of which the agency has redeployed to other zoos as part of its conservation efforts.

In a paper published earlier this year, a team of researchers found that birds born in captivity have slightly lower survival rates for their first year or two but then have equally successful outcomes to wild-hatched birds.

“Because condors reproduce slowly, releases of captive-bred birds are essential to the recovery of the species, especially in light of ongoing losses due to lead-related mortality,” said Victoria Bakker, a quantitative ecologist at Montana State University and lead author of the paper. “The team at the L.A. Zoo should be recognized for their innovative and important contributions to condor recovery.”

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