When I was a lad, we had to use slide rules: Anderson, M.T. Feed. Cambridge, MA: Candlewick Press, 2002.

A variant take on a very popular book.

Titus goes to the moon where his head chip is damaged by a virus. He recovers but a new friend, Violet, doesn't. She recieved her chip late, and her brain reacts by turning to mush. Most of this book is about Violet dying and the inquity of having all information on hand. ie not having to work. Although the book is extremely effective, it's actually one with Charles Sheffield's Jupiter sequence (faux Heinlein) in basically writing off teens and being quite hostile to teen culture. It also doesn't ever really speculate about the possibilities of the head technology, it sees it only as supporting lazyness, not as making it possible to do more.