The central question is whether the current regime of international humanitarian law governing the conduct of hostilities in armed conflict is still adequate to deal with modern conflict scenarios, or whether it needs revision or amendment.

The war between Ukraine and Russia is playing out not just on the battlefield but also on the geopolitical playing field of gas. Conflicts at the start of this century about this energy source were, says PhD candidate Ilia Barboutev, a precursor to today’s war.

From the Big Bang to superconductivity. Many ground-breaking discoveries have been made in Leiden University’s long history.

In educational settings such as museums, universities and schools, white, male, able-bodied and rational subjects still dominate. Although there has been a lot of theoretical work on processes of in- and exclusion through racialization, sexualization, and disabilization, we still know very little about…

At this moment participants are still working on their trajectories. In the summer of 2024, we will have taken the final measurements and will analyse the data. We expect to present the results on this page around September 2024.

Still have questions about the Cyber Security programme? Please contact us!

Are you thinking about studying Mathematics? Learn more and watch the introduction video.

Are you thinking about studying Life Science and Technology? Learn more and watch the introduction video.

Are you thinking about studying Chemistry? Learn more and watch the videos.

Are you thinking about studying Statistics and Data Science? Learn more and watch the introduction video.

Are you thinking about studying Bio-Pharmaceutical Sciences? Learn more and watch the videos.

Are you thinking about studying Astronomy? Learn more and watch the videos.

Governance of Sustainability

Are you thinking about studying Biology? Learn more and watch the videos.

Are you thinking about studying Industrial Ecology? Learn more and watch the introduction video.

Promotores: J. Jonkers, K.E. de Visser

Promotores: F.H. van Lunteren, F.P. Israel

On this section of the website you can find more information about the Old Observatory and the current astronomy research institute.

Despite the fact that gold nanoparticles (GNPs) are one of the most studied nanoparticles, there is still a necessity for new approaches allowing for effective protective coating to enable wider use of GNPs in biomedical applications.

To study how planetary systems come into existence we study much younger systems still in formation.

Clinical development of drugs for central nervous system (CNS) disorders has been particularly challenging and still suffers from high attrition rates.

The effects of anthropogenic noise on interactions between predators and their prey are still little understood.

Morphometric and morphological differences have been used extensively in the past to study domestication of the wolf and the origin of dogs. Certainly before genetic testing was performed, these methods were the only means to diverge both groups. But still now, when aDNA cannot be extracted, morphometry…

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

Synthetic microswimmers take an important place within the interdisciplinary field of active soft matter.

Acidobacteria is a widely distributed phylum but their functional roles in ecosystem processes are still largely elusive.

Does democracy still work? How does political representation function in times of fragmentation, populism and polarization? You will study the challenges that established and new democracies face.

The Old Observatory is still used intensively as a university building. Yet there is still plenty to see and experience in this beautiful monument. Find out what the possibilities are here.

Obtaining imaging data is nowadays only the start of your project. Once the data has been acquired there are many things that still need to be done.

Learn more about the Research master Education and Child Studies at Leiden University

Are you a student and do you find that after reading about the Leiden Leadership Programme, you still have questions?

Are you thinking about studying Child and Adolescent Psychology? Learn more and watch the videos.

Are you thinking about studying the Pre-Master's Programme Psychology? Learn more and watch the videos.

Are you thinking about studying Occupational Health Psychology? Learn more and watch the videos.

Are you thinking about studying Clinical Psychology? Learn more and watch the videos.

Are you thinking about studying Applied Cognitive Psychology? Learn more and watch the videos.

Are you thinking about studying Health and Medical Psychology? Learn more and watch the videos.

Are you thinking about studying Social and Organisational Psychology? Learn more and watch the videos.

Are you thinking about studying Economic and Consumer Psychology? Learn more and watch the videos.

Are you thinking about studying Clinical Neuropsychology? Learn more and watch the videos.

Are you thinking about studying School Psychology? Learn more and watch the videos.

Are you thinking about studying Methodology and Statistics in Psychology? Learn more and watch the videos.

Are you thinking about studying Computer Science? Learn more and watch the videos. Note: As of September 2025 you can also combine this master programme with the Business Studies specialisation.