world richest: do you know them?

have you check world richest list by Forbes?
if you haven't, please do... then tell me which names are familiar to your ear...
Of course I know Bill Gates, Larry Ellison and Paul Allen.. also Larry Page and Sergey Brin from Google... they computer geeks that inspired me to do more with my mac... but who is Li Ka Shing, Bernard Arnault and Lakshmi MIttal?

How they become rich, anyway... Forbes says some inherrited and growing. What else that could be generic way? Do you want to be in the list?