Liquid nitrogen is ice cold. It is as much as 196 degrees below zero! Brrr!!! The students of the Rino Foundation show what cool experiments they can do with nitrogen during their Freezing Physics Show.

The Hortus botanicus Leiden is the oldest botanical garden in the Netherlands. Find out more about the coco de mer, the smallest flower plant, the most painful plant and much more.

Have fun with a replica of the Van Leeuwenhoek microscope. Look through it and wonder at this 350-year-old invention and how important it was. With our digital microscope, you can zoom up to 200 times! We have a table full of beautiful treasures to study, and you can even bring things from home to look at. On your hands, you can see how sweat is produced and immediately vaporises again.

At the photo expo quiz, you will be challenged to decipher ten beautiful photos from the annual Nikon Small World competition. Will you match the right description to the right photo? Do you see the tongue of a sea snail, a neuron of an embryo rat, or the eggs of a moth?

Researchers at Naturalis are studying life. But how do you find out which species are all there? The researchers have come up with a clever trick. They look at the barcode of a species, also known as DNA. And they could really use your help with that trick! Break the barcode and help discover all the species during this fun workshop for families.

Always wanted to know exactly what our neighbours from the Leidse Instrumentmakers School do? During the Leiden Science Family Day, the LiS opens its doors for visitors. What kind of education do they offer and which scientific disciplines are involved? Find out at the LiS!

Travel to Mars, looking at the Milky way or traveling back to the big bang. With the mobile planetarium it is all possible! Are you going to travel with us?

The James Webb Space Telescope is the largest, most powerful space telescope ever built. It will allow scientists to look at what our universe was like about 200 million years after the Big Bang. Come see the scale model and be amazed.