This book is so worth reading. i read it over time. taking 3-4 persons a week as it has so many names-which a lot of them was new to me- . it made me know about people i never knew about and those guys were REALLY important for our development nowadays. what really made me so happy that there were two arabs in the list "Muhammed PBUH ranked 1st/Umr Ibn Al-khatab ranked 52nd". the bad thing about this book it may get a little boring having a lot of details of scientific things that i dont get and