Arabic numerals

I know you love your roots, but you need to be aware of a few things.
The book is A Short History of the Arab Peoples by Sir John Glubb, copyright 1969. This short volume of 300 pages is an executive summary of a four volume more detailed work by this author on the subject.
Most terrifying is the fact that radicalization is not even about a particular ideology anymore. It's about the most devastating terrorist invention of them all: the Arab Numeral zero.