Intelligence is the speed and flexibility of a individual to adapt to new situations. If Einstein and a papua-new-guinea native visit the zoo, and you sneak up on them and shove both into the ice-bear enclosure pool- the guy being eaten for dessert is the most intelligent as he adapted to rapid context change. The problem starts when you view humanity as a meta-species- made from specialized "idiot" cells. Alone they are useless, but together they can build zoos and try to answer the question who shoved who. 20 autistic savants combined, can form together something more clever - but by the zoo-ice-berg metric they are useless.

In the end its really the situation which defines intelligence.