The soon-to-be-officially released Mavic Mini drone from DJI is so small that no FAA registration is required. Which simplifies things. Fewer barriers to flight, right? The palm-size drone boasts a 30-minute flight time but only a 2.7K camera; its big brothers have 4K—but what you lose in rez you gain in stealth. The price is also pretty lightweight. Due out this week.