We made a trip to Technopolis, a museum where you can do experiments yourself. They have a display with optical illusions, and even our au pair was amazed.
I was amazed by the pic above. they show a movies with some colors particles falling down. But if you put your arm horizontal, the particles add up on your arm and fall off behind you, as you can see in the pic.
Luckily they also have a part that is for small kids, like a supermarket, a pizzeria, and son #3 likes to make pizzas. But he didnt want to bring them with the small bike.
The kids also have printed money with their face on...
This is a section about animals, and as you can see by son #1 s face, bats hear very well.
When we left, the kids lifted a car... So a day well spent, interesting and great for kids and parents.