Thanks to this forum I picked up the Murderous Math box set and my DS5 ADORES them! Obviously a lot of the math is over his head, but he won't stop reading them-all of them. So I was thinking of getting him the Horrible Histories, Horrible Science and Horrible Geography. Are these series as good? I notice they are written by different authors. If you child liked one, did they like them all? Is the content appropriate for a five year old?