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The ideal line length for comfortable reading is about 10 words per line. Online scientific journals often use 2x this length. So every sentence is more fatiguing to your eyes & harder to process. You perceive this as the MATERIAL ITSELF being slightly harder than it actually is.
Bonus tip: If you zoom an online (HTML fulltext) journal so the text size increases until it hits that average 10 words per line, you may find that the material feels easier to understand.
For you budding #UXDesign geeks:

Unnecessary cognitive load:
nngroup.com/articles/minim…

Conflating "hard to read" with "the material is hard"➡️Cognitive Ease heuristic (Kahneman, in pic).

Ideal line length➡️Any book on Typography from the last 60 years
amazon.com/Grid-systems-g…
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