It was sleek, cone-shaped, a little confusing — like something Hollywood would give a sci-fi villain for a quick getaway.It wasn’t a helicopter. And it wasn’t an airplane. It was a cross between the two, with a curved hull, two small wings, and eight spinning rotors lined up across its nose and tail.At the touch of button on a computer screen under a nearby tent, it stirred to life, rising up from a grassy slope on a ranch in central California and speeding toward some cattle grazing under a tree — who did not react in the slightest.“ …
