Kurzweil says exponential growth itself is growing exponentially and applies to a wide range of technologies, from electronic to biological.

He estimates a cubic inch of nanotube circuitry would be up to 100 million times more powerful than the human brain.

Kurzweil says there are no simple language tricks that would enable a computer to pass a well designed Turing test. A computer would need to actually master human levels of understanding to pass.