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Started by a friend of mine for his daughter Matilda.

To quote the about page:

In a nutshell, this is the aim of this blog: To explain scientific principals and phenomena in such a way that a child should be able to understand it. It will be a fair while before Matilda is old enough to understand even the most simple of explanations that I will post here but there are such a lot of things to cover, and some really complex ideas to simplify, so I reckon that I need to make a head start.