Sign up for the Slatest to get the most insightful analysis, criticism, and advice out there, delivered to your inbox daily. Yesterday, at a meeting at the White House, first lady Melania Trump entered the room alongside a tall, slim, beige-and-black humanoid robot. (Get your “How can you tell which one is which?” joke out now! There—feel better?) The robot introduced itself as “Figure 3, a humano...