Quote:
Originally Posted by curstpriest
Because textbooks are never distributed exclusively as PDF which this feature won't ever work with anyways? OH right.
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Amazon's own category:
Books › Reference › Education › Test Guides - College & University
Results:
Kindle Books: 139
PDF: 2
Printed books: 3183
Or another:
Books › Reference › Education
Kindle Books (4,276)
PDF (15)
Printed Books (40,576)
Mind we are not talking about what format a particular college uses (the ones you know might indeed use exclusively PDFs, the ones I know - typically MSWord

), but about a Kindle feature, and here the statistics is 139 Kindle Books to 2 PDFs or 4276 Kindle Books to 15 PDFs. Books not bought from Amazon won't ever have the "popular highlights".