Since they are closed due to the pandemic, the Museum für Communication Berlin has a really great series of videos for projects you can do at home with your kids: from making a snow globe, to programming with Scratch, there is something for all age groups!
These videos are all in German but most of the crafts are easy enough to follow along with the visuals. (For the Scratch programming in English, you might want to seek out tutorials directly on the Scratch site.)
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Featured Image: Museum for Kommunikation