I bought this for my son after attending a talk given by the author
My son is 7 and while some reviewers have mentioned it as being more suitable for older children he hasn't put it down
So much so that one night I thought I would have to unscrew his lightbulb to stop him sneakily keep reading it after bedtime - I imagine if I did that he'd just use his torch and keep reading under the covers!
As someone who grew up watching Johny Ball it is good to see someone writing with such passion and humour for what can be seen -wrongly-as a dry subject