The whirring drone hums loudly in the air. It spins fast on its propellers, leaving behind tiny ripples of still-moving air. A long arm extends out from it, carrying a white box with green lights blinking softly. It hovers near my face, then slowly moves away to land beside me. The lights flash brighter as it touches down gently on the soft ground. Inside the box, I can see two sticks that wiggle when the lights blink. A small door pops open, and out slides a round object about the size of a coin. It spins around once before rolling to my other side.