I have a friend – Yossi, who is pretty smart – he says, we really don’t believe in infinity – "if I told you (says he) that you could get into a spaceship and travel forever into space?" – "sure" (you say) but imagine, you have traveled for an infinite amount of time – have you reached the end? – infinity means, you can travel for infinity, and yet still have infinity to go! – ah’ now that’s a bit of a hard concept