Darryl Siry, top bod for marketing, sales and service at electric car maker Tesla Motors, has written an interesting article for VentureBeat - a publication read by investors and venture capitalist. It offers lots of sensible advice for people looking to invest in alternative transport technologies but, reading between the lines, does it also have a hidden message? Does it spell "INVEST in TESLA!", suggesting that the firm might be running short of capital? Or, indeed, does it whisper, "Tesla is for sale"?