The Singularity is Near: When Humans Transcend Biology

by Ray Kurzweil

To compare the rate of progress of the biological evolution of intelligence to that of technological evolution, consider that the most advanced mammals have added about one cubic inch of brain matter every hundred thousand years, whereas we are roughly doubling the computational capacity of computers every year

it took ninety years to achieve the first MIPS per thousand dollars; now we add one MIPS per thousand dollars every five hours.