A lot of the titles include “for kids” but I prefer to think of it all as “for beginners” – I still enjoy reading these sorts of things, and explaining complex topics at a simple level is an art form unto itself.
If you’re looking to learn, here’s a fantastic way to get a ton of multiformat DRM-free ebooks for just $15 (that’s barely over a dollar each!) and support the writers and charity directly.
As of this post on Feb 7, 2015 there’s 11 days left but note that this link will lead to whatever deal is being presented that week so if you’re reading this from the archive, you’ve missed out on a great thing. Go forth and learn!