Howard, you have thought more than anyone in the world about entrepreneurial density – packing in a lot of entrepreneurial firms in a small geography – versus the singular heroic entrepreneur like Elon Musk or Steve Jobs or Bill Gates.    Where in this landscape do you see the greatest potential for breakthroughs that will solve big problems like global warming?   Howard distinguished “big end” entrepreneurs like Bill Gates and Warren Buffett from what he calls everyday entrepreneurs.  On the big...