"What?" Depth Charge blinked, nonplussed. Was this kid for real? "You don't know what...? Never mind. I'll try and explain it. It's like..." He sat back again, this time in thought rather than disappointment. Explaining a robot. Hah. It was like explaining water, or gravity. "A robot's kind of like a human, but made out of metal and full of gears and wires. Everyone from my home planet's like it."