A children version of what the 30 seconds series, for adults, had made for quite a while now, also sometimes see as the Know-it-all series in English. Good and instructive, the illustrations are maybe a bit childish in comparison to the subject. The text seem to be adapt to the 10-12 years old, but the illustrations fit for the kids around 8 or so. So not as well done as the adult version, but still a descent enough adaptation of the series for the children.