While Thomas Edison is arguably the best-known American inventor, a cult following has grown up around Nikola Tesla, the Serbian engineer whose skills as an inventor, perhaps superior to Edison’s, were undermined by his inferior business sense. And this cult MAY have reached its peak on June 29, when the electric car company named Tesla Motors (TSLA) came public, raising $226 million from investors large and small who see great profit potential in the business. I say MAY because there’s a POSSIBILITY that it will be years before this stock (TSLA) closes higher than it did on its very...