Jon Hamilton

Jon Hamilton is a correspondent for NPR's Science Desk. Currently he focuses on neuroscience, health risks, and extreme weather.

Following the 2011 earthquake and tsunami in Japan, Hamilton was part of NPR's team of science reporters and editors who went to Japan to cover the crisis at the Fukushima Dai-ichi nuclear power plant.

Hamilton contributed several pieces to the Science Desk series "The Human Edge," which looked at what makes people the most versatile and powerful species on Earth. His reporting explained how humans use stories, how the highly evolved human brain is made from primitive parts, and what autism reveals about humans social brains.

In 2009, Hamilton received the Michael E. DeBakey Journalism Award for his piece on the neuroscience behind treating autism.

Before joining NPR in 1998, Hamilton was a media fellow with the Henry J. Kaiser Family Foundation studying health policy issues. He reported on states that have improved their Medicaid programs for the poor by enrolling beneficiaries in private HMOs.

From 1995-1997, Hamilton wrote on health and medical topics as a freelance writer, after having been a medical reporter for both The Commercial Appeal and Physician's Weekly.

Hamilton graduated with honors from Oberlin College in Ohio with a Bachelor of Arts degree in English. As a student, he was the editor of the Oberlin Review student newspaper. He earned his master's degree in journalism from Columbia University, where he graduated with honors During his time at Columbia, Hamilton was awarded the Baker Prize for magazine writing and earned a Sherwood traveling fellowship.

In order to see the red of a sunset or the green of spring leaves, developing human eyes need to get the right hormone at the right time.

That's the finding of a team of scientists who studied how color vision develops using hundreds of human retinas grown in the lab.

As a specialist in Alzheimer's prevention, Jessica Langbaum knows that exercising her mental muscles can help keep her brain sharp.

But Langbaum, who holds a doctorate in psychiatric epidemiology, has no formal mental fitness program. She doesn't do crossword puzzles or play computer brain games.

"Just sitting down and doing Sudoku isn't probably going to be the one key thing that's going to prevent you from developing Alzheimer's disease," she says.

Experiments with two gambling monkeys have revealed a small area in the brain that plays a big role in risky decisions.

When researchers inactivated this region in the prefrontal cortex, the rhesus monkeys became less inclined to choose a long shot over a sure thing, the team reported Thursday in the journal Current Biology.

Government scientists have presented new evidence that the plastic additive BPA isn't a health threat.

Low doses of the chemical given to hundreds of rats, "did not elicit clear, biologically plausible adverse effects," said K. Barry Delclos, a research pharmacologist at the Food and Drug Administration's National Center for Toxicological Research.

A new study suggests that ketamine, an increasingly popular treatment for depression, has something in common with drugs like fentanyl and oxycodone.

The small study found evidence that ketamine's effectiveness with depression, demonstrated in many small studies over the past decade, comes from its interaction with the brain's opioid system. A Stanford University team reported their findings Wednesday in The American Journal of Psychiatry.

Scientists have taken another step toward understanding what makes the human brain unique.

An international team has identified a kind of brain cell that exists in people but not mice, the team reported Monday in the journal Nature Neuroscience.

Chris Ferrari was just 18 the first time he balanced a rocket launcher on his right shoulder and aimed it at a practice target.

"Your adrenaline's going and you're trying to focus on getting that round to hit, and then you go to squeeze that trigger and, you know."

Boom!

The report is loud enough to burst the eardrums of anyone not wearing military-grade hearing protection. And the blast wave from the weapon is so powerful it feels like a whole-body punch.

There's new evidence that a woman's levels of female sex hormones, including estrogen and progesterone, can influence her risk of Alzheimer's and other forms of dementia.

Women are less likely to develop dementia later in life if they begin to menstruate earlier, go through menopause later, and have more than one child, researchers reported Monday at the Alzheimer's Association International Conference in Chicago.

Every day, Dr. Walter Koroshetz, 65, takes a pill as part of his effort to help keep his brain healthy and sharp.

The pill is his blood pressure medication. And Koroshetz, who directs the National Institute of Neurological Disorders and Stroke, says controlling high blood pressure helps him reduce his risk of dementia.

He also keeps his blood pressure down by exercising and paying attention to his weight and diet. "I'm a believer," he says.

Alan Dambach was in his late 50s when he noticed how unsteady his hands had become.

Over the next decade, his tremor got so bad he had difficulty eating with a spoon or fixing equipment at his family's tree farm in Western Pennsylvania.

"I couldn't get nuts and bolts to work," he says.

Two common herpes viruses appear to play a role in Alzheimer's disease.

The viruses, best known for causing a distinctive skin rash in young children, are abundant in brain tissue from people with Alzheimer's, a team of scientists reports Thursday in Neuron. The team also found evidence that the viruses can interact with brain cells in ways that could accelerate the disease.

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ARI SHAPIRO, HOST:

For six years now, life has been really good for James. He has a great job as the creative director of an advertising firm in New York City. He enjoys spending time with his wife and kids.

And it has all been possible, he says, because for the past six years he has been taking a drug called ketamine.

For the first time, the U.S. military is speaking publicly about what it's doing to address potential health risks to troops who operate certain powerful shoulder-mounted weapons.

These bazooka-like weapons produce forceful explosions just inches from the operator's head.

A new application of artificial intelligence could help researchers solve medical mysteries ranging from cancer to Alzheimer's.

It's a 3D model of a living human cell that lets scientists study the interior structures of a cell even when they can only see the exterior and the nucleus — the largest structure in a cell. The model was unveiled to the public Wednesday by the Allen Institute for Cell Science in Seattle.

Military personnel may be endangering their own brains when they operate certain shoulder-fired weapons, according to an Army-commissioned report released Monday.

The report, from the Center for a New American Security, says these bazooka-like weapons pose a hazard because they are powered by an explosion just inches from the operator's head.

Bits of human brain tissue no larger than a pea are forcing scientists to think about questions as large as the nature of consciousness.

These clusters of living brain cells are popularly known as minibrains, though scientists prefer to call them cerebral organoids. At the moment, they remain extremely rudimentary versions of an actual human brain and are used primarily to study brain development and disorders like autism.

The words "dog" and "fog" sound pretty similar. Yet even a preschooler knows whether you're talking about a puppy or the weather.

Now scientists at Georgetown University Medical Center in Washington, D.C., have identified a two-step process that helps our brains learn to first recognize, then categorize new sounds even when the differences are subtle.

An international coalition of brain researchers is suggesting a new way of looking at Alzheimer's.

Instead of defining the disease through symptoms like memory problems or fuzzy thinking, the scientists want to focus on biological changes in the brain associated with Alzheimer's. These include the plaques and tangles that build up in the brains of people with the disease.

But they say the new approach is intended only for research studies and isn't yet ready for use by most doctors who treat Alzheimer's patients.

The Afghan boy arrived at the U.S. military hospital in Kandahar with severe burns from the chest down. He was about 5.

"I knew as soon as I saw him it was just too much surface area," says Kit Parker, who, at the time, was an Army Civil Affairs officer working with Afghan villagers. "I knew he was going to die."

Even so, Parker and his team sergeant, Aaron Chapman, stayed at the hospital throughout that night in 2003, while military doctors worked to keep the boy alive.

Updated March 8 at 1:53 p.m. ET

A major study is challenging the widely held view that adult human brains make new neurons.

The study of 59 samples from 29 brains of people of various ages found no immature neurons in anyone older than 13, scientists report online Wednesday in the journal Nature.

When the body gets dehydrated, the brain tells us to start chugging fluids. But what tells us when to stop?

The answer appears to be a brain circuit that acts like a water meter, constantly measuring how much fluid we are taking in, a team reports Wednesday in the journal Nature.

The chemical BPA isn't living up to its nasty reputation.

A two-year government study of rats found that even high doses of the plastic additive produced only "minimal effects," and that these effects could have occurred by chance.

The finding bolsters the Food and Drug Administration's 2014 assessment that water bottles and other products containing BPA are not making people sick.

Beer has fueled a lot of bad ideas. But on a Friday afternoon in 2007, it helped two Alzheimer's researchers come up with a really a good one.

A little electrical brain stimulation can go a long way in boosting memory.

The key is to deliver a tiny pulse of electricity to exactly the right place at exactly the right moment, a team reports in Tuesday's Nature Communications.

"We saw a 15 percent improvement in memory," says Michael Kahana, a professor of psychology at the University of Pennsylvania and an author of the study.

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