Want to know the current population of India? The internet is your best bet. Need a quick refresher on the phases of the moon? Go ahead, read a story online (or two or three). But if you really need to learn something, you’re probably better off with print. Or at least that’s what a lot of research now suggests.

Many studies have shown that when people read on-screen, they don’t understand what they’ve read as well as when they read in print. Even worse, many don’t realize they’re not getting it. For example, researchers in Spain and Israel took a close look at 54 studies comparing digital and print reading. Their 2018 study involved more than 171,000 readers. Comprehension, they found, was better overall when people read print rather than digital texts. The researchers shared the results in Educational Research Review.