Note there is a small file of the raw scanned book page images, and also a huge file that I believe has been OCR'd (optical character recognition), which should give you the ability to search the text by keyword. I forgot to mention that advantage of ebooks - keyword searching.
The recent advancements in understanding of learning disabilities is fascinating. Dyslexia, autism spectrum disorders, non-verbal learning disorder, etc. People who were previously categorized as dumb are now respected as "eccentric geniuses". Standardized tests are being reworked to account for them, corporate recruiters in certain tech fields are favoring them, and being "a little different" is becoming a bragging right rather than an embarrassment.