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Our days are dominated by screens: the morning news, ads on the metro, work documents at the office, the dozens of texts we send a day, and to top it off, a good TV show in the evening. But for a lot of people, novels are best enjoyed on paper. And that鈥檚 even after the invention of electronic book readers (e-readers like Kobo鈥檚 or Amazon鈥檚 Kindle), which can hold all the books in the world in a single lightweight device. But the 鈥減aperless book鈥� has not even come close to replacing its print equivalents: Many people argue that it鈥檚 more difficult to read off of screens, that they prefer paper copies, especially for longer articles and novels. Is it possible then that paper is just better for us?

When it comes to liquid crystal display (LCD) screens, like your phone or laptop, researchers find varying results. Some research has shown that, that they tend to be more distracted. Others have shown that. This causes our eyes to dry out faster and contributes to what all 9-5 office workers are well familiar with: visual fatigue. But these effects don鈥檛 usually translate to e-readers. Studies often find That鈥檚 because the most popular e-readers use a fundamentally different technology than what is found in your phone or laptop. They use e-paper or e-ink,a special kind of flexible display created to mimic printed paper.

Invented in the late 90鈥檚 by a group of MIT undergraduates, e-ink harnesses a common laboratory technique called electrophoresis. In other words, it uses electricity to move particles. The surface of e-paper is lined with thousands of tiny capsules, each containing black and white ink pigments. These are the exact same kind found in traditional printers, and are have either a positive or negative electrical charge. This allows each pigment to be switched 鈥榦n鈥� or 鈥榦ff鈥� instantly by changing the electric current running through the surface of the paper. When a negative charge is applied, the positively charged black pigments rise above the white, and the pixel on the surface appears black. Thus everywhere on a page where a letter should appear, there is a negative charge. Everywhere else where the e-paper appears white, a positive charge is applied. You can think of e-paper like an electrically powered: instead of shaking the paper to change how it looks, a new charge is applied and the ink pigments move to reflect that.

Researchers believe that, since e-paper doesn鈥檛 emit any light of its own, just like regular paper, this might explain why e-ink is 鈥渂etter鈥� for us than reading off laptops or tablets. For example, that exposure to artificial light from LCD devices in the evening can reduce your brain鈥檚 secretion of melatonin 鈥� the hormone that induces sleep. Thus screen use before bedtime is associated with more difficulty falling asleep and less time spent sleeping. E-readers however do not share this effect; in this case they behave just like paper.

So e-ink holds up pretty well when compared to its paper predecessor, and yet there鈥檚 nothing quite like cracking open a new book: that faint musty smell, crisp unturned pages, perfect unbent spine., but involves wider cognitive processes including memory, emotion, and other sensory information. Take for example the physicality of a novel: your progress through a story is matched by your physical process through a book, the right side shrinks as the left side grows. You can physically feel your position in a book. Although e-readers offer progress bars as a symbolic indication of your place, many readers feel it鈥檚 not quite the same. Since books themselves are not just lines of text, they carry emotional significance and a sense of ownership which. Don鈥檛 expect e-books to be replacing the real deal anytime soon.

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