News
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Cosmic magnifying glass reveals exceptionally heavy dormant black hole in the early universeAstronomy 05 June 2026Astronomers have measured the mass of a dormant, supermassive black hole in the early universe for the first time. Thanks to a combination of the Jame...
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How can we push back Earth Overshoot Day?Sustainability 05 June 2026Earth Overshoot Day, the day on which humanity has used all the natural resources that the Earth can regenerate in a single year, falls on 30 July thi...
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How can we properly measure the impact of disasters, attacks, and wars?Book 04 June 2026In Chasing Events, researcher Thijs van Dooremalen explores how we can truly understand the impact of major events. He shows that traditional comparis...
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Students bring turbulent past of Valkenburg airfield to lifeHeritage 03 June 2026The former Valkenburg airfield is steeped in history: the Romans defended their empire here, German forces landed here in 1940 and even the Cold War l...
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How a small amount of rare earth metal shapes the environmental impact of magnetsEnvironmental sciences 02 June 2026Magnets for electric cars and wind turbines contain only a small amount of the rare earth metal dysprosium. Yet, this metal is responsible for a large...
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Leiden Declaration: AI is challenging the core values of mathematicsOpinion 02 June 2026In the ‘Leiden Declaration’, an international group of researchers warns that AI is putting fundamental values of the discipline under threat. The ris...
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The Hortus as a living lab: new technology reveals hidden relationships between speciesInaugural lecture 01 June 2026Hortus botanicus Leiden is a treasure trove for research into interactions between species. Surprising discoveries are being made with new techniques ...
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Second edition of 'Nacht van de Digitale Veiligheid' a success: digital resilience requires collaborationNacht van de digitale veiligheid 01 June 2026With a full auditorium at the university's Wijnhaven campus, an extensive programme, inspiring speakers and visitors from a wide range of disciplines,...
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Medieval insights for modern urban planningPhD defence 01 June 2026In his PhD research, historical geographer Marcel IJsselstijn developed a new approach that improves our understanding of how medieval cities were pla...
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Grant for projects that help researchers harness data and technologyNWO grants 01 June 2026The Thematic Digital Competence Centres (TDCC) are network organisations that help researchers harness digital data and technology. They connect exper...
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Video: Everyone’s a little bit autistic... aren’t they?Autism 01 June 2026Autism: for some, ‘we’re all a little bit autistic’, whereas for others it conjures up images of mathematical geniuses or boys lacking empathy. Pedago...
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Project mapping Early-Medieval connections launches in Leiden29 May 2026Having received a European Research Centre grant in 2025 the Connected Communities in Early Medieval Europe (COCO) project kicked off with a three-day...
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UN vote on climate change does not change the law, but will affect the courtroomInterview 29 May 2026A clear majority in the UN confirmed that states are obliged to combat climate change. 141 countries voted in favour, 8 against, including the US, Rus...
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Forty Years of Dutch Studies Celebrated in Festive Style in Leiden28 May 2026The bachelor’s programme in Dutch Studies marked its fortieth anniversary on 22 May with a festive gathering in Leiden.
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CWTS and OpenAIRE strengthen collaborationCollaboration 28 May 2026CWTS and OpenAIRE are delighted to announce the next steps we have agreed to take to deepen our relationship and strengthen our collaboration.