a16z's @jkhamehl reveals the thesis behind its $1.1B Machine Age Fund: everything below the software stack was largely uninvestable for 30 years. AI changed that "We announced this $1.1 billion Machine Age Fund to invest into all of the physical constructs of the world that is now so bottlenecked given all of the demands in AI. Think about it as everything below the software stack." "All the physical parts of enabling AI, from data centers to chips to custom silicon, networking, rack sys, all…