If you think drones are a passing fad, better think again

If you’re used to thinking of drones as a passing fad, last week’s CES gadget show should give you second thoughts.
Tiny, self-piloted copters promise to buzzily follow you around like something out of a Neal Stephenson cyberpunk novel. New drones that could find lost wilderness adventurers or help them see out above treetops; others purport to carry a human passenger at the touch of a button.
None of this, of course, will be happening overnight. Limited battery life means that many