DJI wants everyone to be able to fly a drone. At least, that's the message it seems to be sending with the Spark ($499), the company's smallest aircraft yet. It's a selfie drone you can interact with just by waving your hand. It's also a short-range quadcopter that can be controlled with your smartphone, complete with forward obstacle avoidance and subject tracking capabilities. Add an accessory remote and you've got a very capable bird, with a 31mph top speed and a robust operating range.