Graphene : BEST OF THIS PLANET

HERE'S A RIDDLE: WHAT DO A BILLIONAIRE, A BUNNY, AND A PENCIL HAVE IN COMMON? THE ANSWER -- IS BATTERIES. FIRST, THE BUNNY. HE RUNS ON BATTERIES BUT REALLY, HE'S HERE TO KEEP YOU WATCHING A STORY ABOUT BATTERIES. THE BILLIONAIRE IS ELON MUSK, FOUNDER OF TESLA MOTORS AND SOLAR CITY.