One reason it's so good is that while it would (I think) work for the stereotypical grandma or curious youngster, it's also really interesting for readers who a

One reason it's so good is that while it would (I think) work for the stereotypical grandma or curious youngster, it's also really interesting for readers who aren't complete novices. It assumes no pre-existing knowledge, and it starts quite slowly, but by the end I reckon anyone who isn't a CS grad will have deepened or solidified their understanding.