For younger readers

For young readers curious of all, this series against which I admit I had a lot of preconceptions in is very well done: a good translation enjoyable to read, two young heroes endearing and very different from one another, a dose of magic ... and that's driven to all sorts of times and places ....
Historical points are always documented, and the reader will discover additional concepts of the school.
CP to CE2 they can devour generally independent volumes, from prehistory to the twentieth century, the Titanic to the Eiffel Tower ...
A great success.