An expert is a person who has made all the mistakes that can be made in a very narrow field - Niels

Simple: You become one :)

What shell we do if there is not any experts?!

lol I guess that's why I'm writing my science-fiction novels in English, even though a friend of mine who is a professional translator says it doesn't make sense :)

"Always listen to experts. They'll tell you what can't be done and why. Then do it." (Robert A. Heinlein)

"The expert knows more and more about less and less until he knows everything about nothing." (Gandhi)