Reseachers of the Institute of Environmental Sciences Leiden (CML) have contributed to a debate in the Journal Nature over whether lions in Africa can only be saved with dollars and fences.

From 1 June 2020, Jorrit Rijpma will be holding the chair in European Law, specialization Area of Freedom, Security and Justice.

EU foreign policy has become increasingly politicised over the past years, amongst others as a consequence of the succession of crises. Crises may engender processes of crisis framing and contestation. This article focuses on how the policy demands being voiced in these processes of contestation are…

How should European financial law best integrate considering the interaction of the relevant legal systems?

Research on this theme addresses the systemic risks faced by European societies and affecting the quality of life of European citizens.

This book is the first comparative study of estimative intelligence and strategic surprise in a European context, complementing and testing insights from previous studies centred on the United States. It does extensive empirical analysis of open-source material and interviews in relation to three cases…

Cambridge University Press has published a new book co-authored by researchers from Leiden University, offering both an introduction to machine learning and deep neural networks, and an overview of their applications in quantum physics and chemistry — from reinforcement learning for controlling quantum…

The handbook is a wide-ranging survey of a crucial period in prehistory during which many social, economic, and technological changes took place. Written by specialists in the field, the book provides coverage both of the themes that characterise the period, and of the specific developments that took…

How can we understand the implementation of EU policy and what challenges are involved?

Ben Van Rompuy participated as an invited expert in the 22nd Annual Meeting of the Association of European Competition Law Judges (AECLJ), which took place in Berlin between 30 May and 1 June 2024. The event was co-organised by the European Commission.

All the data stored and processed by our computers is encoded as sequences of zeros and ones, called bits. Quantum computers offer an alternative to this traditional way of encoding and manipulating information.

The European Homicide Monitor (EHM) offers a standardized framework for countries and regions to compare homicide characteristics, patterns and trends.

In our European and International Business Law Advanced Master programme, you learn to decipher the hierarchy of European & international business law

The article deals with the influence of the Agreement on the Free Movement of Persons between Switzerland and the EU on the international tax separation, more specifically on the tax separation of tax deductions for natural persons.

The European Council and the European Commission have a similar role in agenda setting. Both place issues on the EU agenda. However, these institutions have distinct designs. They have different political attributes (the European Council has considerably more political authority) and information-processing…

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What political factors affect the speed or duration of EU legislative decision-making?

Farmers on the outskirts of Nairobi National Park protect their livestock using flashing lights on top of the animal enclosures. This system keeps lions away at night. Leiden research has shown that the method is both simple and effective. Publication in PLOS ONE.

International Relations and European Politics is one of the three organisational clusters of the Institute of Political Science.

Set up in 1991, this unique project aims to identify and describe the common lexical heritage of the most important Indo-European languages and language branches. The project has thus far resulted in twelve volumes published as The Leiden Indo-European Etymological Dictionary Series (Brill, Leiden).

When EU member states signed the Treaty of Lisbon in 2007, they did not anticipate the manifold crises in store for them over the following years. Instead of the intended consolidation of a Union which had just gone through its most profound modernisation and biggest round of enlargements, the EU has…

Assessing Learning in Higher Education addresses what is probably the most time-consuming part of the work of staff in higher education, and something to the complexity of which many of the recent developments in higher education have added. Getting assessment ‘right’– that is, designing and implementing…

Lions in Kenya respond very differently to human land use, climate and conservation practices. That is the conclusion of thesis from Leiden biologist Monica Chege. A uniform approach is therefore insufficient. ‘Effective conservation only works when management is tailored to local conditions and developed…

Does a shared idea of the ‘public servant’ exist in Europe? Sager, Overeem, and others explore.

How do secondary school teachers’ professional learning preferences relate to teaching experience and the school context?

Our research deals with the deep history of Europe and Eurasia, from the inception of farming up until the beginning of the Roman Period. This was a period in which key developments took place that had a profound impact on European landscapes and society until the present day. Our research and teaching…

The Dutch asylum application centre in Ter Apel is overburdened, an issue that is currently a prominent feature in the Dutch media. In podcast De Verbranders, PhD students Neske Baerwaldt and Wiebe Ruijtenberg engage in dialogue, and use different angles to examine themes related to migration, borders…

In this research project, the protection of personal data is compared in eight EU member states: France, Germany, the UK, Ireland, Romania, Italy, Sweden and the Netherlands. The comparison of the countries is focused on government policies for the protection of personal data, the applicable laws and…

LION

Corona be damned, it's high time for the yearly LION Image award! Deadline in a week.

Leiden’s Institute for History has an exceptionally strong expertise in premodern European history in its global context, with specialists whose interests cover virtually the whole continent. We have a strong track record in leading larger research teams and work together with colleagues across Europe…

In the Netherlands, various local VVD parties are calling for an asylum stop. Other political parties, Ja21, BBB, PVV and FvD, also see an asylum stop as the solution to the continuing asylum problems. Earlier, an opinion poll showed that a majority (69 per cent) of the Dutch population agrees. Is an…

This paper, written by Silvia D'Amato & Andrea Terlizzi, investigates the extent to which the European Union is strategically engaging against terrorism.

This thesis investigates the contribution of quantum computers to machine learning, a field called Quantum Machine Learning. Quantum Machine Learning promises innovative perspectives and methods for solving complex problems in machine learning, leveraging the unique capabilities of quantum computers…

On Wednesday April 26 University Libraries Leiden organizes a study afternoon (in Dutch) dedicated to the handwritten prayer book in the Middle Ages.

Cristina Grasseni’s project

Our Master Law in European and International Human Rights Law (LL.M.) looks at the various human rights protection mechanisms from a comparative perspective

It's time for the 2021 Image Award

Finally, it's high time for the yearly LION Image award. Send us your most impressive, beautiful or insightful physics image, and win eternal fame on top of 100 euros, and a year long exhibition on the LION picture wall.

The term “Lone Actor” has been applied to a variety of violent individuals who are thought to act out of ideological motivations using terrorist tactics.

The corona crisis is also a disinformation crisis for the global community in general, and for the European Union (EU) in particular. What is less clear is how adequate the EU’s response to the ‘infodemic’ has been. This essay exposes the dangers of disinformation for the EU, which have intensified…

Do recent developments in the European security architecture signal the end of multilateral cooperation, or the beginning of a new era with emerging forms of international security collaboration?

In this dissertation (titled: Exploring the Synergies between Transfer in Reinforcement Learning and Procedural Content Generation) we explore how the two research fields named in the title, namely Transfer in Reinforcement Learning (TRL) and Procedural Content Generation (PCG) can synergize togethe…

Promotor: J. N. Kok, Co-promotor: A. J. Knobbe

Are you thinking about studying European Politics and Society? Learn more and watch the programme presentation.

On 15 January, the winner of the famed LION Image Award will be announced. Submissions ranged from the famous 3d printed microboat to an eerily abstract graph depicting a Majorana fermion.

We are happy to announce the 4th annual LION Image Award!