If a customer gripes that its telephone book is light on ink, Daly can look at a report on the print run and, if he sees that the last 1% of the run wasn't dark enough, tell the client to open another box because the rest of the run was fine.

FORBES: Companies & Strategies

For example, iron-gall ink, commonly used on ancient documents, is transparent to infra-red light and most visible in the ultraviolet region of the spectrum.

ECONOMIST: Monitor

Weighing just 5.98 ounces, Kindle is small and light enough to fit easily in a pocket and take everywhere, and still features the same 6-inch electronic ink display that reads like real paper.

ENGADGET: Amazon announces $119 Kindle Paperwhite with illuminated, capacitive touch display

Weighing just 170 grams, Kindle is small and light enough to fit easily in a pocket and take everywhere, and still features the same 6-inch electronic ink display that reads like real paper.

ENGADGET: Amazon's new Kindles now available in Canada, Paperwhite starting at CAD $139