Mariana Lenharo

@marilenharo.bsky.social

Life sciences reporter at Nature.

More than 40,000 insect species may live in a tiny patch of the Amazon, from the ground to the canopy. That's nearly half of all the insect species described in Brazil. I wrote about the ambitious project behind this estimate for @nature.com. It could uncover tens of thousands of species:

Tiny patch of Amazon likely holds 40,000 insect species — many new to science

Megaproject involving hundreds of sites is cataloguing rainforest insects from the ground to the canopy.

nature.com

Must economies keep growing to end poverty? And can growth continue without pushing the planet beyond its limits? For @nature.com, I spoke with researchers holding different views to explain this contentious debate in economics www.nature.com/articles/d41...

How to end poverty and protect Earth: inside the debate tearing up economics

The idea of prosperity without growth is gaining traction among researchers. So why are many economists sceptical?

nature.com

As more professionals begin to rely on AI tools in their work, many are starting to worry that they could lose their hard-earned skills. Their fear might be justified. Early evidence suggests this is beginning to happen in medicine, computer science and other fields. My latest story for @nature.com:

Is AI ruining our skills? Early results are in — and they’re not good

Reliance on artificial-intelligence tools degrades the abilities of physicians and software engineers, studies show.

nature.com

Could obesity drugs also improve male fertility? Recent studies found associations between these medications and increases in testosterone levels and sperm quality in men. In this story for @nature.com, I take a closer look at the findings and what researchers think might be driving them. #GLP-1

The latest benefit of obesity drugs: boosting testosterone and sperm quality

Preliminary study finds that testosterone levels increase or stabilize in people taking GLP-1 medications.

nature.com

As the biggest sporting event kicks off, we’ve looked at how FIFA is using science in this year’s tournament. From AI-generated 3D avatars, to footballs with sensors, to real-time sensors to provide match analytics… #worldcup2026 Story by @marilenharo.bsky.social www.nature.com/articles/d41...

This World Cup could be the most high-tech yet — the innovations to watch for

Nature asked a football-journal chief about emerging trends in the sport, from AI tools to PhD students embedded with teams.

nature.com

AI tools are getting better at diagnosing conditions based on patient reports. But can they truly benefit people in real-world clinics? For @nature.com, I spoke with specialists in medical AI to make sense of the wave of 'AI vs. Doctors' studies that have made headlines in recent years

How good are ‘AI doctors’ — and will they take over medicine?

Nature talks to specialists about whether people might soon be diagnosed by artificial-intelligence systems.

nature.com

Yesterday—4 days after OMB released its proposal to revamp all federal funding—there were 3500+ comments. Today there are nearly 4,500. Our story on the damage the proposal could inflict on science and the researchers pushing back. Reported w/@marilenharo.bsky.social:

White House proposes vast overhaul of US science funding: what you need to know

The Trump administration’s proposal aims to improve transparency in federal funding, but critics fear the proposed rules would politicize research

nature.com

What doesn’t kill a paper can make it more highly cited. An analysis of peer-review records for thousands of papers finds that those receiving tough reviews go on to have a higher impact than those that sail through the review process. My latest story for @nature.com: www.nature.com/articles/d41...

Tough peer-review process? Your paper might end up being more highly cited

An AI-led analysis of publicly available peer-review reports links requests for major revisions with papers that end up having high impact.

nature.com

Just as people are drawn to the songs that defined their youth, scientists keep going back to the papers that shaped them early in their careers. An analysis of millions of papers revealed this academic “nostalgia effect” Read more at @nature.com www.nature.com/articles/d41... #scienceofscience

Early-career researchers do more ‘disruptive’ science than veterans

Analysis of papers from millions of scientists shows that older researchers tend to stick with ideas from their past.

nature.com

Clinical trials of GLP-1 obesity drugs show impressive average weight loss, but responses vary from person to person. Genetics may help explain why. A study from 23andMe links genetic variants to weight loss and side effects. My latest story for @nature.com www.nature.com/articles/d41...

Why obesity drugs work better for some people: these genes hold clues

Study of almost 28,000 people also identifies genetic variants that raise the risk of gastrointestinal side effects from GLP-1 medications.

nature.com

In a region of Nigeria where about 80% of girls marry before age 18, a program helped many stay in school and delay marriage, increasing their chances of earning an independent income and having greater control over their lives. My latest story for @nature.com www.nature.com/articles/d41...

Child marriages plunged when girls stayed in school in Nigeria

Collaboration between researchers and religious leaders led to a cut in the likelihood of early marriage by 80%.

nature.com

We're hiring at Nature! Our US News team is looking for a reporter based in New York or Washington DC. You'll need reporting and writing experience, along with knowledge of the US science landscape. Apply by March 27 via the link below go.nature.com/3N8UkFA

Reporter, Nature News

Job Title: Reporter, Nature Location: Washington DC or New York (Hybrid Working Model) Application Deadline: March 27, 2026 About Springer Nature Springer Nature is one of the leading publishers of research in the world. We publish the largest number of journals and books and are a pioneer in open research. Through our leading brands, trusted for more than 180 years, we provide technology-enabled products, platforms and services that help researchers to uncover new ideas and share their discoveries, health professionals to stay at the forefront of medical science, and educators to advance learning. We are proud to be part of progress, working together with the communities we serve to share knowledge and bring greater understanding to the world. For more information, please visit https://go.https://go.https://go.nature.com/4lh1cNV/4lh1cNV/4leI0jL and follow @SpringerNature About the Brand Nature Portfolio’s high-quality journals and services across the life, physical, chemical and applied sciences help move science and society forward. Nature Portfolio is home to the leading, international weekly journal of science, Nature – founded in 1869. It is also home to the Nature research and Nature Reviews journals, the leading open access multidisciplinary journal Nature Communications, and open access journals including Scientific Reports. Together, these journals publish some of the world's most significant scientific discoveries. Online, nature.com provides over nine million unique visitors per month with content, including news and comment from the Nature journal, and the leading scientific jobs board, Nature Careers. As part of Springer Nature, Nature Portfolio also offers a range of researcher services, including online and in-person training. For more information, please visit nature.com and follow @NaturePortfolio About the Role As a Nature News Reporter, you will pitch and write news articles about science and the research community each week for publication in print and online. You will also regularly pitch and write news features, contribute to multimedia, and advise the wider magazine on coverage of your beat. This role will be based in the United States and will have a focus on reporting on the United States and the Americas, with an emphasis on physical sciences, energy and the environment, and technology, including AI. The successful candidate will be comfortable writing stories from any region and interviewing scientists anywhere, and will be an all-rounder with the enthusiasm and curiosity to report across the sciences. Responsibilities Pitch, report, and write a stream of original news and features articles that appeal to Nature’s global audience of working scientists Write clear, accurate, and compelling prose; deliver copy to tight deadlines Regularly find exclusive, original story ideas that appeal to Nature’s audience and drive traffic and engagement Use insights gleaned from audience analytics to guide pitches and framing of stories Keep on top of the global news agenda and suggest angles that will appeal to Nature’s audience of working researchers Build a network of trusted sources leading to exclusive stories Work collaboratively with a team of reporters and editors spread around the world Experience, Skills & Qualifications Essential Experience reporting and writing on scientific developments, science policy or the research community Ability to grasp scientific concepts quickly and write about them clearly Understanding of journalistic values and best practices Bachelor's degree required in journalism or science related fields Desirable Experience writing about physical sciences, energy and the environment, and technology, including AI Knowledge of the US science landscape and/or more broadly that of the Americas Experience working to fast daily deadlines Experience using audience analytics to understand audience interests and drive pitches Understanding of the challenges and opportunities facing working scientists Knowledge in an array of science topics and fields Experience reporting stories in multimedia formats, such as podcast and video To apply please submit: Your updated resume A cover letter explaining your interest in the post, and why you are qualified 3-5 clips that showcase your writing and reporting skills (please submit PDFs - not just links.) Application Deadline: March 27, 2026 Springer Nature Skills associated with this Job Profile include: SN-Publishing Workflows & Systems, SN-Storytelling, SN-Writing Skills, SN-Adaptability, SN-Communicates Effectively, SN-Interpersonal Awareness, SN-Cultivates Innovation, SN-Global Perspective, SN-Governance, Risk and Compliance Management, SN-Social Media Savvy, SN-Journalistic Skills Springer Nature US provides a comprehensive and competitive benefits package which includes the benefit offerings listed below: Medical, Dental and Vision 401(k) with company match and contribution Hybrid office working policy, Summer Hours, and paid time off Flexible Spending and Commuter programs Multiple Life insurance options Disability coverage Tuition Assistance Voluntary benefits: Identity Theft Protection, Pet Insurance, and Legal Assistance Insurance Employee Assistance Program Family friendly benefits and a variety of employee discounts An array of Employee Social Networks US Annualized Base Salary Range: $85,000 - $100,000. The salary offer may vary based on work experience, education, skill level, and equity. The US salary range does not align with the salary ranges in other countries when converted to the currency of that country. Springer Nature is an Equal Opportunity Employer that complies with the laws and regulations set forth in the following https://go.nature.com/4lgJhXp poster. At Springer Nature, our mission is to be part of progress – and that begins with inclusion: of people, perspectives, and ideas. We believe that diverse perspectives drive progress, and we are committed to creating an environment where people and ideas can flourish. If you have any access needs related to disability, neurodivergence or a chronic condition, please contact us so we can make all necessary accommodation. Find out more about our DEI work here: https://go.nature.com/4lmCkUY For more information about career opportunities in Springer Nature please visit https://go.nature.com/4rV8Z6f #LI-EG1 Job Posting End Date: 28-03-2026 We are an ambitious and dynamic organisation, and home to some of the best-known names in research, educational and professional publishing. Working at the heart of a changing industry, we are always looking for great people who care about delivering quality to our customers and the communities we work alongside. In return, you will find that we open the doors to discovery for all our employees – offering opportunities to learn from some of the best in the business, with a culture that encourages curiosity and empowers people to find solutions and act on their instincts. Whether you are at the beginning of your career or are an experienced professional, we invite you to find out more about the roles we offer and explore our current vacancies. We are a global and progressive business, founded on a heritage of trusted and respected brands – including Springer, founded in 1842, Macmillan, founded in 1843 and Nature, first published in 1869. Nearly two centuries of progress and advancement in science and education have helped shape the business we are today. Research and learning continues to be the cornerstone of progress, and we will continue to open doors to discovery through trusted brands and innovative products and services. Springer Nature Group was created in May 2015 through the combination of Nature Publishing Group, Macmillan Education and Springer Science+Business Media.

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🧬🧪 They didn’t follow especially healthy diets and many had limited access to advanced medical care. Yet they lived past 110. Researchers in Brazil are now looking to their diverse genomes for clues about their longevity. My latest story for @nature.com: www.nature.com/articles/d41...

Still working at 107: supercentenarian study probes genetics of extreme longevity

Scientists seek to understand the factors that have allowed people in Brazil to reach their 100th or even 110th birthdays despite facing adversities.

nature.com

I stopped putting protein powder in my breakfast after making this video (with producer & extra extraordinaire @nickpetrichowe.bsky.social) It's based on this great story by @marilenharo.bsky.social from the end of last year🧪 www.nature.com/articles/d41... Do you need more protein? Watch & learn!

Nick Petrić Howe@nickpetrichowe.bsky.social · 7mo ago

Watch this video if you want to: A) Find out how much protein you actually need 🍗 B) You want to see me dress up as a German Chemist from the 1840s 🧪 C) You're a fan of @lizziegibney.bsky.social's amazing presentation style 💃 D) All of the above

It turns out female mosquitoes are in charge during sex. A study found they give a subtle signal when they accept a mate, a overturing decades of assumptions about mosquito behavior. I wrote about this fascinating work by @leahhouri.bsky.social, @leslievosshall.bsky.social et al for @nature.com:

Glowing sperm helps to reveal secrets of mosquito sex

Female Aedes mosquitoes signal that copulation can proceed by subtly extending their genitalia.

nature.com

Maria Branyas Morera lived to the age of 117 with a bit of genetic luck and a healthy diet that included daily yogurts, according to a study published today. I wrote about the findings, and what they can tell us about longevity, for @nature.com #longevity #aging #genomics

She lived to 117: what her genes and lifestyle tell us about longevity

Maria Branyas Morera was the oldest person in the world when she died. Scientists analysed her genes, metabolism and more.

nature.com