Others worry that a data-driven approach could hinder the kinds of creative risks that produce great literature.

WSJ: Your E-Book Is Reading You

This is a consideration most aircraft don't need to worry about but the Transition, driven on salty roads, most certainly will.

ENGADGET: Terrafugia Transition aircraft first hands-on (video)

For all the familiar signs of British economic frailty that are now making headlines, such as demand driven by consumption rather than investment, the biggest long-term worry is a different one: whether productivity growth, troublingly weak in the past few years, can revive.

ECONOMIST: Living standards