"They spent five days reading from a paperback and five days from an iPad." ... and proceed to show a kindle in the pictures. Of course, the iPad has a screen

"They spent five days reading from a paperback and five days from an iPad." ... and proceed to show a kindle in the pictures. Of course, the iPad has a screen so it's going to damage your sleep. The refresh rate + bright blue light is bad for you. Why did they need to make a study for that? That's know. What I am wondering is a backlight e-ink display. No refresh rate, and a dim backlight. Now, that's a study that is worth it.