You are almost certainly reading this sentence on a screen, which means that these words are just a stream of whirring electrons, passed along a network of wires, servers and, yes, tubes full of glass fibers.

For the most part, we are deeply ignorant of how the Internet happens; we take the infinitude of information for granted. But in this thrilling adventure book, Blum takes us inside the infrastructure. He visits every waystation standing between you and this world of zeroes and

—Jonah Lehrer