The brain was not designed for reading. There are no genes for reading like there are for language or vision. But spurred by the emergence of Egyptian hieroglyphics, the Phoenician alphabet, Chinese paper and, finally, the Gutenberg press, the brain has adapted to read.

Before the Internet, the brain read mostly in linear ways — one page led to the next page, and so on. Sure, there might be pictures mixed in with the text, but there didn’t tend to be many distractions. Reading in print even gave us a remarkable ability to remember where key information was in a book simply by the layout, researchers said. We’d know a protagonist died on the page with the two long paragraphs after the page with all that dialogue.

The Internet is different. —The Washington Post.