How do atoms and molecules end up forming planets? That's what astrochemist Julia Santos studied during her PhD. She discovered the dominant process behind the formation of methanol in space – a finding that surprised the entire field.

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…

Not only dark matter, but also ordinary matter and dark energy are tracked in the largest ever cosmological computer simulation ever. In the FLAMINGO simulations, you can see virtual galaxies and clusters of galaxies emerging over the course of billions of years. This is no easy task: with more than…

The International Astronautical Congress (IAC) that took place last week in Paris was extremely successful for IIASL.

From study places to consulting collections and from a meeting with your faculty liaison to getting books after opening hours: the new Science Library offers it all. The library moved to a brand new location in the Gorlaeus building and will be open starting 15 April.

The faculty Happy Holidays Drinks for all staff and student assistants was held on Tuesday 19 December. There was a great turn out and fun was had by all.

The special of the Dutch History Programme Andere Tijden 'Missie Geslaagd?' (Mission accomplished?) tells the story of the last fathers of the Holy Spirit Congregation who live in Gennep. Professor of Anthropology and Sociology of Africa Peter Pels is one of the specialists in this episode. He explains…

The Leiden archaeologist Harold Berghuis was closely involved in archaeological discoveries off the coast of Java. Skull fragments and other fossil remains provide new insights into the world of Homo erectus. The discovery was the subject of numerous news reports.

Sufyan Al Karaimeh, a guest researcher at the Faculty of Archaeology, is currently involved in the Aerial Archaeology in Jordan (AAJ) Project. Over the past 25 years, the individuals involved in this project have not only compiled an expansive collection of photographs but have also helped discover…

Associate professor Salvador Santino Regilme spoke in various media outlets about the tensions between the United States and Venezuela.

When deciding what to study you undoubtedly read a lot of information about your study programme. Leiden University employs various systems to provide information about programmes and courses and to facilitate communication between lecturers and students.

When deciding what to study you undoubtedly read a lot of information about your study programme. Leiden University employs various systems to provide information about programmes and courses and to facilitate communication between lecturers and students.

Xiang van der Boon, a third-year Law and Tax Law student, went to Bilbao in 2025 to study at the University of Deusto for five months. She learned a lot about herself: ‘Living abroad showed me it's important to make time to relax.’

University lecturer Laurie Cosmo, having grown up in New York, came to the Hague from Rome, Italy, where she fell under the spell of the Kunstmuseum. ‘I loved the building even before I worked at Leiden University.’

He started out as a temporary staff member at the CML’s education office, and now – eight years later – Jasper Williams is the institute’s new Director of Operations. In this interview, he talks about entrepreneurship, making a social impact, and playing competitive bridge. ‘I like doing things properly,…

Starting as an MP during the Covid-19 pandemic and after the recent ‘role elsewhere’ debacle during the coalition talks for a new Dutch government, alumna Mariëlle is looking forward to making a real contribution in society.

The rise of AI will transform the role of doctors, claims Professor of Intensive Care Medicine Sesmu Arbous. Her academic chair focuses on integrating technology into patient care.

Lindsey Boosten followed her passion by combining the study of aviation and law in the Advanced Master in Air and Space Law in Leiden. It turned out to be a great choice: ‘It was one of the best years from my student days.’

Femke is a third-year student of Dutch Language and Culture. She was a board member for a year, did an internship in times of COVID-19, and above all has a passion for her mother tongue.

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.

An Honours Class about the ostensibly unrecognisable worlds of insular Southeast Asia teaches students a fundamental piece of wisdom: "We do not differ much from the people at the other end of the world."

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.

Starting as an MP during the Covid-19 pandemic and after the recent ‘role elsewhere’ debacle during the coalition talks for a new Dutch government, alumna Mariëlle is looking forward to making a real contribution in society.

On Tuesday 10 January, the Meijers Lecture was held followed by the New Year’s reception in the restaurant of the Kamerlingh Onnes Gebouw. Dean Joanne van der Leun opened the reception with a New Year’s speech. The following is a short overview of the event.

This Honours College track empowers you to address societal challenges by enhancing new skills and competencies.

We start the second day of the FLO event with the skills workshops. We have 2 rounds of skills workshops about several skills.

The Indonesian government has been trying to enforce marriage and divorce laws for some time. These efforts are encountering resistance from both local communities and the Indonesian Supreme Court. PhD candidate Al Farabi investigated where this resistance comes from.

In a new article in the journal Scientific Reports, Leiden archaeologist Wei Chu and colleagues report on recent excavations in Western Romania at the site of Româneşti, one of the most important sites in southeastern Europe associated with the earliest Homo sapiens. The site gives an important glimpse…

Jus post bellum, the body of laws and norms governing the transition from armed conflict to peace, has emerged as a crucial issue for international law scholars, governments, and all concerned with building a just and sustainable peace. The Jus Post Bellum Project, funded by the NWO and hosted by the…

Representatives of the Faculty of Archaeology recently traveled to the Caribbean island of St. Eustatius to repatriate human remains. The remains, originally excavated in the 1980s, will eventually be reinterred on the island.

This February Metje Postma will stop teaching and retire. But she is not done with the discipline yet: she will finish her PhD and there are still five films on the shelf that she plans to complete.

Buried beneath a Suffolk forest, archaeologists have uncovered the earliest known human-made fire. A fire that was sparked 400,000 years ago. This stunning UK discovery may rewrite our evolutionary story, potentially pushing fire-making back by more than 350,000 years.

Writing a book on the recent history of Leiden University in corona times. For educational and policy historian Pieter Slaman (34), this has meant working in the attic of his parents’ house while they looked after his daughter, along with numerous online conversations and very few, if any, visits to…

Tahir Abbas was named full professor of radicalization studies by the Executive Board. This chair, according to Abbas, is an excellent opportunity for ISGA to broaden its current focus on terrorism and political violence. Abbas was interviewed about his ambitions, writing as a form of relaxation, and…

With a single sample of water or soil, researches can analyse the DNA of everything that is living in that environment. During her research, PhD candidate Beilun Zhao discovered a way to analyse not only the kind of species, but also the age of the species in a water sample. The method showed its first…

Whereas the Netherlands Court of Audit used to conduct an investigation once a year, the average civil service organisation now has a few per year to contend with. Is so much going wrong nowadays? Not at all, says Professor by Special Appointment Sjoerd Keulen. ‘It’s one of the methods that makes democracy…

After the May elections a new University Council has now taken seat. The university democracy is the result of the long-lived national student protests in 1969. Students from Leiden joined the protests for greater representation, although their actions were less revolutionary than at other universities.…

The documentary ‘De Stem van het Kind’ (The Voice of the Child) gives an impressive insight into the work of juvenile court judges. Documentary maker Pieter Fleury, Professor of Children’s Rights Ton Liefaard and juvenile court judge Johan Visser worked together for the past seven years to make the…

Research Master’s students in Archaeology Rosa Seepma and Aida Tadesse received an Incentive Prize from the Dutch Association for Physical Anthropology (NVFA). They were awarded this honor for their ongoing study on the human osteology collection at the Allard Pierson Museum.

Ward Hoskens started ten years ago as an intern at one of Leiden's most iconic buildings: the Pieterskerk. Now he is doing his PhD on the question of how the function of this 'church that is no longer a church' changed over recent centuries.

A patent for what may be a potent, new antibiotic. And: a clear overview of promising approaches to overcome a crucial resistance tactic employed by bacteria. In the span of one week, two researchers from Leiden are receiving their PhDs, each of them on an important step in the battle against bacteria…

For three days, our faculty was all about We are Science Week: the community event full of fun activities for our staff and students. Besides the famous Beat the Professor PubQuiz, this year you could take USC yoga classes in the Gorlaeus garden, escape from Einstein's Escaperoom and sing along at the…

The Faculty of Humanities’ On-Campus Master’s Experience Day was a pleasantly busy event. The information sessions and corresponding information market went down well with interested undergraduates.

Assistant Professor Juan Masullo of the Institute of Political Science has been awarded the 2025 Alexander George Best Article Award for his work on interviews and process tracing.

Postdoctoral researcher Veronica Tamorri and a PhD candidate Maia Casna held an online osteoarchaeological class for secondary school children. However, based on reactions, the exchange of ideas seemed to go both ways.

Leiden's iGEM team has won high honours at the Grand Jamboree in Paris. The biology students came second in the Overgraduate category with their project PHAse Out. They also took home awards for Best Biomanufacturing Project, Best Wiki and Best Entrepreneurship as well as a Gold Medal. To top it all…

Astronomers led by Simon Portegies Zwart used simulations to reconstruct how three stars were ejected from the star cluster R136, 60,000 years ago. The analysis reveals that five stars were involved in the event in the Tarantula Nebula.

Inspectors at the Dutch Tax and Customs Administration can require people to provide more information relating to their tax returns. Esther Huiskers-Stoop from the Tax Law department investigated the rules in place to protect us when we are required to provide information to the tax authorities.

The shock wave triggered by one of the five galaxies making up the iconic Stephan’s Quintet appears to be less disruptive than previously thought, with the shock likely being cushioned by dust particles in the surrounding gas. This is according to the analysis of the first scientific observations of…