It really is the GOLDEN AGE of hardware startups. For basically all of history, hardware was the worst business you could pick. You needed a factory, a supply chain, a hardware engineer, tens of millions of dollars, and 2 years before you could even find out if anyone wanted the thing. That's why almost nobody did it, and the few who tried mostly died on the manufacturing. What's happening now is that every one of those walls is coming down at the same time. 1. The brains got cheap…