“Part of that process is... intellectual technology. Not only do we have hardware.., we... have the software... [e.g.,] the development of calculus, you can think of as an intellectual technology.., a machine of ideas and techniques in the brain... which you can... apply to... problems. The development of intellectual technology is... one of the secrets of advancing. Each generation inherits the intellectual technology... [with] more powerful tools it can push the ideas further.”