duizendknoop
KNOTWEED
Knotweed is not weed. It is a weed however. In Dutch, this plant is called a ‘duizendknoop’, which means ‘a thousand buttons’ or ‘a thousand knots’. A thousand knots seem worrying in any case. A thousand knots in your hair, probably mean you have to shave your head. And you don’t want the wind to be at a thousand knots either. The Japanese knotweed is one of the most invasive plants in the Netherlands. The strong roots and stems can damage the area in which it is located in several ways. Worst of all? It’s very hard to get rid of!
Activiteiten
Seeing Stars Citizen Science
During the night of Seeing Stars Leiden, Citizen Science will try to answer many burning questions!
More-than-Planet
Starting on the 2nd of July, you can view a new exhibition at the Leiden Observatory: More-than-Planet. How do we imagine our planet?
Planktonium
Museum De Lakenhal shows planktonium by Jan van Ijken: a magical art film about the life of plankton.
The Leiden Maths Walk
For lovers of maths, there's a walk they can go on all by themselves: The Leiden Maths Walk with challenging mathematical questions.
