Hi Tiger,

Your post was made seperately, so I merged here to maintain some focus on the discussion.

Which textbook are you referring to?

For one thing, the above paragraph you posted would not be allowed in any decent college textbooks.

Why? Technical and medical textbooks go through a lot of reviews to ensure correctness as much as possible and being upto date with scientific findings.

Sure, a mistake can occure in a textbook, but not in such abundance

If I'm mistaken, I hope you would provide the exact title, ISBN and page number in order for me to verify that it managed to slip into a textbook.

Wa'il