We may love books, but do we know what lies behind them? In The Book, Keith Houston reveals that the paper, ink, thread, glue, and board from which a book is made tell as rich a story as the words on its pages - of civilizations, empires, human ingenuity, and madness. In an invitingly tactile history of this 2,000-year-old medium, Houston follows the development of writing, printing, the art of illustrations, and binding to show how we have moved from cuneiform tablets and papyrus scrolls to the hardcovers and paperbacks of today.

After discussing what an algorithm does and how its effectiveness can be measured, Louridas covers three of the most fundamental applications areas: graphs, which describe networks, from eighteenth-century problems to today's social networks; searching, and how to find the fastest way to search; and sorting, and the importance of choosing the best algorithm for particular tasks. He then presents larger-scale applications: PageRank, Google's founding algorithm; and neural networks and deep learning.

Critical thinking is regularly cited as an essential 21st century skill, the key to success in school and work. Given our propensity to believe fake news, draw incorrect conclusions, and make decisions based on emotion rather than reason, it might even be said that critical thinking is vital to the survival of a democratic society. But what, exactly, is critical thinking? Haber describes the term's origins in such disciplines as philosophy, psychology, and science.

Do you worry that you've lost patience for anything longer than a tweet? If so, you're not alone. Digital-age pundits warn that as our appetite for books dwindles, so too do the virtues in which printed, bound objects once trained us: the willpower to focus on a sustained argument, the curiosity to look beyond the day's news, the willingness to be alone. The shelves of the world's great libraries, though, tell a more complicated story. Examining the wear and tear on the books that they contain, English professor Leah Price finds scant evidence that a golden age of reading ever existed.

Songs of Innocence and of Experience is a collection of 45 poems by English poet William Blake. "Songs of Innocence" is the first part of the collection and appeared in 1789 with engraved illustrations by Blake. The second part, "Songs of Experience", also illustrated, was added in 1794 when Blake published the whole under the full title of Songs of Innocence and Experience Showing the Two Contrary States of the Human Soul.