Is life convex??

I was listening to a video lecture by Stephen Boyd and he, being an awesome professor had my complete attention. He was explaining about convex optimization and one student asks 'Is life convex?'. He says, 'to prove this, take 2 instances and their weighted average. That life has to be better than the average of the qualities of the individual lives'. That reply left me speechless.

I mean, I should applaud for the fact that he could come up with that reply at that instant. I am yet so watch his other videos. I am sure, I ll be amazed by such replies of his in all the other lectures. :)