What Chance a Stone?

It's intriguing how often I'll chuck away a possible thread for an idea of a topic for a post [cf. last night's scribble], and then find myself faced with the potential substance of that post the following day. In today's case, I read with interest a piece in today's Financial Times about Cortical Labs' early stage experiments in implementing 'biological intelligence', using lab-grown human brain cells living on silicon substrates from which their responses can be 'read' and via which they can be 'trained' [or at least 'nudged']. So far they have created a machine they have dubbed 'CL1', with 200,000 brain cells. The aim of this endeavour is to create computing devices of enormous power that, like the human brain, '...consume many orders of magnitude less energy than conventional electronics...'. If realisable in genuinely practical terms, this would leapfrog current developments in the field of quantum computing, ...