DJI Spark hand gestures work -- but not always

The new DJI Spark drone says it responds to hand gestures for flights. How easy is it to master? Jefferson Graham takes it out for a first flight to find out on #TalkingTech. Over the weekend, I took the DJI Spark out to the beach, performing a series of exercises to control the $499 device that made me look like I was either Jedi master or Tai Chi practitioner. With the force of my hand wave, I could control a digital device -- a magical feeling. Often, the Spark worked as advertised.