Introduction: What is PDF, who owns it and why it matters | Leonard Rosenthol & Duff Johnson

Presented at PDF Day in Washington DC, December 10 2014

[zborhbtmk]

I know many nationalities are creative, therefore i put this idea hoping it becomes true someday : may test exam sections inside books (any scientific material) be like this, after the question choices instead of going to the end of the book and seek the correct answer, there will be hyperlink under the question, when clicked it will show correct answer and explanation as message box or hint

[chinawatchshop]

comeon one more thumbs down and it's even