In this edition of The Motley Fool's "Ask a Fool" series, Motley Fool Rule Breakers analyst Simon Erickson takes a question from a reader who asks: "Any insight as to where fuel cell technology is heading in the Fool's opinion?"
Simon focuses on the recent hot streak of Plug Power (PLUG +7.11%), whose stock price has risen nearly 500% after the company announced deals with Air Liquide and FedEx (FDX +0.65%). He offers two things that investors should keep an eye on, as well as his take on the stock right now.
