To mark the university’s 450th anniversary, the Leiden Discoveries science route has been updated and was relaunched on the Night of Discoveries. New signs in town and a revamped website tell Leiden residents and visitors the stories of the city’s spectacular discoveries.

The university has been shaping the city of Leiden for 450 years. A brief history of the university buildings that have helped define the city.

Discover budding creators, artists and researchers at the Night of Discoveries art and knowledge festival. And many researchers from Leiden University are taking part.

Ten Leiden museums and heritage institutions have curated the online exhibition ‘Carel’s Universe’. They selected objects from their collections that symbolise retiring Rector Magnificus Carel Stolker and the research in Leiden. With direct references, playful associations and the odd nod and wink.

Immediately connect with the needs of industry with your master’s degree. The new course Practical Aspects of Quality Management in Pharma and Biotech provides just that. The LACDR and LUMC set up the course together with the Biotech Training Facility, located at the Leiden Bio Science Park. The first…

Planets existing in other solar systems contain invaluable information about the origin of planets and life. PhD candidate Yapeng Zhang has studied their atmospheres by looking at their smallest parts: isotopes. With her research she hopes to discover what makes our own solar system unique.

What is the mission of our Faculty? How do we view diversity and inclusion? And how do we think about the growth of our Faculty in the broadest sense of the word? These themes were the focus of the first brainstorming session for the new faculty strategy. Some 65 staff and students from all levels of…

Leiden researchers Max van Duijn (Leiden Institute of Advanced Computer Science) and Vasilika Kosta (Leiden Law School, Europa Institute) will join The Young Academy (Royal Netherlands Academy of Arts and Sciences) KNAW)).

A time-lapse of the universe in more detail than ever before: that’s the aim of the NSF–DOE Vera C. Rubin Observatory in Chile, which will unveil its first images of the night sky on 23 June. Researchers at Leiden Observatory have played a major role in making it all possible.

Ten years ago, a new reward system was introduced in Dutch prisons: the only way prisoners could earn extra ‘freedoms’ was through good behaviour. Jan Maarten Elbers concludes that this system does little to encourage behavioural change and can even be counterproductive.

Organisation

Do you know a children's book fanatic? According to the Griffel-jury, 'Rekenen voor je Leven' (Calculating for your life) by Science Communication Professor Ionica Smeets is highly recommended. The book was awarded a silver ‘Griffel’, one of the highest awards for Dutch children’s literature. And that…

Early July was the graduation ceremony of the Leiden Leadership Programme,: a moment to reflect and celebrate the outcomes of eight months’ hard work. Leiden’s Marekerk was filled with colourful music and some wise pieces of advice: ‘Find the path that suits you best.’

Scientific Director of the Leiden Academic Centre for Drug Research (LACDR) Hubertus Irth: ‘We test substances and look for new concepts for treating disease.’

From a powerful documentary to a heartwarming classic: four Leiden alumni have chosen their favourite films and will introduce them at Leiden International Film Festival.

They confounded expectations and went to university anyway – as a woman of colour, a working-class student or refugee... Throughout the centuries the university has always welcomed pioneers. Students for whom going to university was not the obvious choice and who did not grow up in an academic environment.…

What will it be like to study at Leiden University in 2075? Ten surprising, artistic uni-visions could be brought to life. It’s up to you to vote for your favourite.

A dissertation covered in hot pink faux fur, antique prints of PhD ceremonies, a pot encrusted with sealing wax: the Hora est! anniversary exhibition at Oude UB takes you to the ritual yet idiosyncratic world of PhD ceremonies.

Conference

Are you curious about how the human skeleton works? Discover this and more on 3 October in Leiden and on 4 October in The Hague.

Smiling faces, sweltering heat and a record-breaking donation – that was the Leiden Science Run 2025. On Saturday 21 June, the Leiden Bio Science Park turned bright orange as enthusiastic runners completed 4.5 kilometres to support research for vulnerable children.

There are many links between Leiden and the US. The highest office there has been held an impressive nine times by presidents with Leiden roots. This has led to memorable visits to Leiden University.

Paul Gobée (LUMC), Kirsty Rolfe (Humanities) and Frank Takes (Science) have been nominated for the Leiden Teaching Prize 2023.

Amid the many traditions of Leiden’s 3 October Festival, a relative newcomer is beginning to take hold: the Science Market. At market stalls, the people of Leiden could explore or even participate in Leiden’s research – performing an ‘operation’ in the street, for example.

The university was a gift from William of Orange to the people of Leiden for their courageous resistance to the Spanish. We’ve all heard the story of the university’s foundation. But its foundation was also a success story for two friends.

The Plants & Planets exhibition brings two worlds together in a dazzling mix of science, nature and art. It opens at Old Observatory Leiden and Hortus botanicus on 7 February.

Glorious sunshine, dozens of enthusiastic academics and huge numbers of Leiden residents ensured that this year’s special jubilee version of 3 October University was a great success.

Not everything that comes close to a black hole is swallowed by it. Black holes can also hurl material away, and that chance turns out to be considerably bigger than previously thought. Martijn Oei's accidental discovery and his subsequent research on it earned him a cum laude promotion on 12 Decemb…

During his PhD research, mathematician Tyron Lardy worked on a new approach to hypothesis testing. Instead of the traditional p-value, he uses so-called e-values. These turn out to be more flexible – especially when you want to look at your results midway through the study.

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.

Environmental scientist Rutger Hoekstra addressed the General Assembly of the United Nations on 12 April. And that’s quite a big thing to do. How do you get there as a scientist? And, more importantly, what was his message? In eight questions, Rutger explains what he does and why.

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.

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,…

It is with deep sorrow that we share the news that our dear colleague Andrea Evers passed away on Monday, 4 August 2025. Since 2013, Andrea had been affiliated with the Faculty of Social and Behavioural Sciences at Leiden University as Professor of Health Psychology. She was an undeniable driving force…

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.

Hydrogen can help to solve the climate problem. At least, if we start producing it in the right, clean way. Leiden researchers mapped out the global environmental impact of hydrogen production and looked ahead to 2050. They published their work in Energy & Environmental Science.

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.'

Canal Watch (De Grachtwacht), which has been cleaning canals since 2018, has received the Dutch Research Council (NWO) Communication Initiative Award.

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.

Three quantum-safe cryptography methods have been standardised for worldwide use since this week. Léo Ducas co-designed the two primary PQC methods selected for this standardisation. Ducas is part of the Cryptology group at Centrum Wiskunde & Informatica (CWI) and is also professor of Mathematical cryptology…

The members of the Duivelsei student association are games mad, be it computer or board games. Game of the Goose and Ludo have fallen out of favour. The students prefer more-challenging board games or online gaming instead. ‘You can be yourself here.’

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 university is launching a campaign to focus extra attention on our smoke-free university locations. The University is using aptly named cigarette barrels to try to show clearly just how many cigarette filters are being saved from the environment. How harmful are these cigarette filters to the e…

Anthropologist Rodrigo Ochigame studies how AI is changing the practice of scientific research. From astrophysics to mathematics to climate science, they find that the adoption of new AI models is raising questions about what counts as reliable scientific evidence.

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.

Hydropower plants need not be disastrous for fishermen and nature. For that, we need to place new dams more strategically, but also modify or even remove some existing ones. Valerio Barbarossa and Rafael Schmitt showed that with a computer model of the Asian Mekong basin.

Protests have been raging in Iran for two months since the death of 22-year-old Mahsa Amini. The role of social media in the protests against the Iranian regime should not be underestimated, says Senior Assistant Professor and Iranian Babak RezaeeDaryakenari.

After hard work in the lab, Chemist Tirong Guo has developed a group of materials that provide a stable and efficient foundation for artificial photosynthesis. Will this enable the large-scale production of hydrogen and other useful compounds in the most sustainable way possible? Guo will defend her…

Three student athletes from Leiden University are representing the Netherlands at the FISU Summer World University Games, a kind of Olympic Games for students.

Peter Stevenhagen delivered daily lectures at the Syed Babar Ali School of Science and Engineering in Lahore, in collaboration with ICTP, a well-known UNESCO institute in Trieste. The aim is to enhance it he knowledge of students from low- and middle-income countries. ‘By teaching here, I can truly…