On 14 May, curator and professor Ruurd Halbertsma will be leaving the National Museum of Antiquities (RMO) after forty years of dedicated service. In fact, it will be a double farewell: Venusval (‘Venus trap’), the last part of his trilogy about Tjalling Kingma, the fictional curator of the classical…

As an experiment, student Alicia Cai relied solely on AI tools such as ChatGPT and Claude for supervision while writing her thesis. What lessons were learned?

Can we reshape school playgrounds through data and design? By using AI and wearable sensors, data scientist Maedeh Nasri discovered ways to create environments where children, including those with ADHD and autism, can connect, play, and grow.

A team led by Leiden University in the Netherlands and the National Radio Astronomy Observatory have, for the first time, robustly detected semi-heavy water ice around a young sunlike star. In this ice, some of the ordinary hydrogen atoms have been replaced by deuterium, a heavier variant of hydroge…

A new administrative culture. Renewed vigour. More transparency. Will it become reality with the new government? And how do you go about achieving it? By all of us striving to change together: not just politicians, but also stakeholders, civil servants, media, and civilians. That was the conclusion…

An international team of astronomers led by Ardjan Sturm of the Observatory has made the first two-dimensional inventory of ice in a planet-forming disk of dust and gas surrounding a young star. The researches, including Melissa McClure, used the James Webb Space Telescope and publish their findings…

Within just a few years, the Chinese government's policy towards the Uyghurs deteriorated sharply. From control and marginalisation, it shifted to violation of human rights. PhD candidate Elke Spiessens was right in the middle of it with her research. 'The fabric of the community is being completely…

The liquidator is, according to the law, the initial designated person to signal and address irregularities in insolvencies. But when tackling fraud costs more than it generates, what does that mean for the liquidator’s course of action? And which factors obstruct liquidators in addressing these irregularities?…

‘A challenging rollercoaster, but also a very bonding and insightful experience,’ that’s how the team of iGEM Leiden 2022 wraps up their participation in the iGEM contest. The contest for synthetic biology climaxed during the Grand Jamboree in Paris. The team ended up in the top 10 of over 360 teams…

Today, ESA’s Gaia mission releases its new treasure trove of data about our home galaxy. Astronomers, led by the Leiden astronomer Anthony Brown, describe strange ‘starquakes’, stellar DNA, asymmetric motions and other fascinating insights in this most detailed Milky Way survey to date.

Fantastic plants, dizzying patterns and pulsating sounds: researchers from Leiden are going to study the effects of a simulated psychedelic trip on the mind and body at Lowlands Festival. Why might this be interesting for therapies?

When you think of migration, you probably won’t immediately think of dating apps. Yet such apps are important to many migrants, such as those who identify as lesbian, gay, bi, trans, queer or questioning (LGBT+). Researcher Andrew DJ Shield studied the role that dating apps play in the migration process,…

Many traces of the city's slavery history can be found in Leiden but the public isn't always aware of them. The initiators of 'Mapping Slavery in Leiden' want to change this with guided tours and street markers. Representatives of the University and other Leiden institutions will be giving the first…

Astronomers have used data from the European Gaia Space Telescope to discover 55 high-speed stars launched from the young star cluster R136 in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. This increases tenfold the number of known “runaway stars” in this region. The team of astronomers,…

By far the majority of users of child sexual abuse networks (or child porn forums as they are sometimes called) on the dark web do not actively communicate there but download illegal material, therefore committing a criminal offence. But they often stay under the police and judiciary’s radar. PhD candidate…

Mark Rutte, the Dutch prime minister, gave a guest lecture to first-year law students at Leiden University. He spoke about democracy, the war in Ukraine and the role of the Netherlands.

'After my BA International Studies I decided to do the MA International Relations, and that proved to be a good choice,' Mats Radeck (23, Trier, Germany) says. He is in the last phase of the MA, working on his thesis on "lone-wolf terrorism".

Friday October 24th Honours students had to present their case studies on a topical issue related to Humanities. All Honours students made posters in pairs of two and had to defend their case in front of an audience at the Old Observatory. It was a tense experience, since they were being graded by…

What did medieval scholars think of the books they read? In her inaugural lecture, Professor Mariken Teeuwen will talk about the texts they wrote in the margin.

'Working on your leadership starts tonight,' says lecturer Sandra Groeneveld at the introductory meeting of the Leiden Leadership Programme. The programme has been renewed this year, and students are ready to dive into it: 'I hope to get to know myself.'

Data about COVID-19 were everywhere during the pandemic, but how will all this data continue to be managed and kept open so that it is usable in the future? We spoke with Kathleen Gregory, researcher at the Centre for Science and Technology Studies (CWTS), who will study this question in a new project…

Wat weten we over de kinderen die achterblijven na (ex-)partnerdoding? Regisseur Sara Kolster en hoogleraar Marieke Liem sloegen de handen ineen om deze groep slachtoffers in beeld te brengen: met de indrukwekkende documentaire ‘Blauwdruk’ en nieuwe cijfers uit de Femicide Monitor.

Jasper Knoester is the dean of the Faculty of Science. How is he doing, what exactly does he do and what does his day look like? In each newsletter, Jasper gives an insight into his life.

The Phase 3 clinical trial results of the promising Covid-19 vaccine of Johnson & Johnson are expected this month. The Dutch electron microscopy facility NeCEN helped develop the company’s vaccine, and they have now published their scientific findings in Nature Communications.

The need for knowledge among practitioners and the lack of an academic knowledge base for specifically collective arrangements of social work in the Netherlands were the reason for Anouk de Koning, Femke Kaulingfreks and Maartje van der Woude to start working on a Dutch Research Agenda (NWA) application…

Using biomethane to produce ammonia, a crucial chemical in agriculture, could drastically reduce the climate impact of the process. In a study published in One Earth, researcher Robert Istrate shows it’s even possible to make ammonia production net-zero or carbon negative.

Teens with depression appear to be more sensitive to criticism from their parents than their healthy peers are.

Racism and discrimination come in many different shapes and forms – in the Netherlands too. Verbal attacks, stereotypes and violence: some people are confronted with these on a daily basis. A group that is often not included in research and the debate on racism is people of Asian descent. The Diversity…

For over a year now, the James Webb Telescope has been sending stunning images that exceed astronomers’ expectations. The photos are fascinating to see, but what exactly are we looking at? Assistant professor Melissa McClure explains.

An atomic vandal has finally been caught! Scientists from Leiden University and the Department of Energy’s SLAC National Laboratory have uncovered the mysterious cause behind the rapid corrosion of platinum electrodes. This breakthrough paves the way for more affordable green hydrogen production and…

How can we safeguard children’s rights in conflict zones? The winners of the 2025 Children’s Rights Moot Court Competition, team 19 from O.P. Jindal Global University in India, show unique potential to bring about positive change in this area.

‘Raising awareness of the disorder is crucial since borderline personality disorder (BPD) still faces considerable stigma ’, says Anne Krause-Utz (Clinical Psychology) . Together with an international team of excellent scientists, Krause-Utz provides an update of current knowledge about this disorder,…

The rise of populist parties, the expansion of the role of the state and now the fragmentation of the Senate and the House of Representatives: Dutch political reality has changed rapidly over recent decades. These developments are in stark contrast to Dutch constitutional law that has remained almost…

Ijeoma Uchegbu is Professor of Pharmacy at University College London (UCL). As a female scientist of colour, she was initially reluctant to play an active role in the university’s diversity policy. Until, that is, she had a radical change of heart: ‘I knew it; I had to become an evangelist.'

Our banking, DigiD and sensitive medical data: what if our entire digital infrastructure can no longer be trusted? Jelle Don has this question permanently in mind as he goes about his research. And that is no bad thing because without new digital security measures, our society will be extremely vuln…

How do politics and play relate to each other? Six Leiden academics hope to find an answer to that question over the coming years. They have received an NWO grant of 750,000 euros. Professor Sybille Lammes and University Lecturer Bram tell us how they plan to spend the money.

What’s at stake at the NATO summit in The Hague? Three academics from Leiden share their insights.

This year, an NWO PhD in the Humanities grant went to Mink van IJzendoorn, enabling him to investigate the disappearance of amphorae. ‘We take means of packaging and shipment for granted, but they are deeply ingrained in our daily lives; they are crucial.’

Thomas Moerland studied medicine and mathematics in Leiden and has a lifelong fascination with the origins and workings of intelligence. He brought all that together in his popular science book Van IQ naar AI (From IQ to AI).

Whilst the world is opening up, the teaching will continue in a hybrid form next academic year. During the past year, when all of us were bound to our home offices and computer screens, new forms of education had to be developed – some of which proved to be efficient in preparing the students for their…

Is it a prehistoric mammoth tooth or just an ordinary pebble? It was National Finds Day at the Dutch National Museum of Antiquities on Saturday 17 June, and Leiden University was one of the collaborating partners.

Minister Alexandra van Huffelen will attend the 'Leadership in the digital transition' event at Campus Wijnhaven organised by Alex Ingrams on 16 February. Five questions to Ingrams about the event.

Religious studies specialist and historian Tom-Eric Krijger talks about the new pope. Will he be a mediator or someone who dares to take a stand?

The whole world gets raw materials from Latin America, but at the expense of nature. Håvar Solheim researches the role of organised crime in this environmental crime and Soledad Valdivia researches sustainable urban initiatives in Latin America. What do these university lecturers think the future of…

This year Leiden will be celebrating the 450th Relief of Leiden. Leiden master’s students are researching this history as part of the ‘Traces of 3 October’ project.

What is freedom worth in times of hunger? ‘Beleg’ is a modern interpretation of Lucretia van Merken’s 1774 play. With five performances in Leiden’s Schouwburg theatre, the play is a prominent part of the Relief of Leiden celebrations, and Leiden alumni are playing a big role. Take a look behind the…

On Friday 29 August 2025, 370 students received their Bachelor's degree in International Studies. The diplomas were awarded in the historic setting of the Pieterskerk in Leiden. Family members, friends, and staff gathered to celebrate this joyous occasion with the graduates in a packed Pieterskerk.

On the university’s birthday, professors teach a class of 10 and 11-year-olds during Meet the Professor. The professors were bombarded with questions.

In May 2022 Lennart Kruijer succesfully defended his PhD, which he wrote as a member of the VICI Project ‘Innovating Objects’, led by prof. Miguel John Versluys. So succesfully, in fact, that he was awarded the Cum Laude honors. Just a short time later he was awarded a grant and a fellowship to further…

She walked into the Sylvius building as a wide-eyed twenty-something in 1984, and next year, she’ll be leaving us as a soon-to-be retiree in her sixties. Ine Tijdens (66) reflects on more than four decades at LACDR. ‘One year, I got a little whip for Sinterklaas. That says something about my persona…