Yes it's interesting the different ways cultures have of filling gaps while speaking. English-speaking people usually say "um", or "ah". I was amused in Scotland when the first person I asked for directions started out, "em". My brother reckons he could never give a speech in Maori because his throat would become raw. He's not able to cough enough. Have you got maori ancestry Fallible? (joke).

On topic. I don't know the best way to explain exactly how evolution actually works. Pictures are obviously a necessity. Maybe a film of the Darwin redux...