www
Hip hip, hooray! Today is the World Wide Web's birthday. Just 33 years ago, British physicist Tim Berners-Lee coined the prefix http://www to indicate that a document was 'online'. It took a few more years before Netscape became the first Internet browser and made it possible to navigate the WWW. And everything after that has become cache or cash. Incidentally, the bundling of computers that we call the internet is older. The military ARPANET, later made accessible to everyone through universities, enjoys that honour.
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Playing with mathematics
Maths is really everywhere. Make a whirlpool and build your own bridge. Discover what sound looks like and play with perspective like an art...
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.
